Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d21d9f39d27885…

MALICIOUS

PDF

60.0 KB Created: 2020-08-12 05:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 00f91b92bdb43ed9d580541897dc584b SHA-1: 11b4403b57234370f3b27866e0b2d97af2082e81 SHA-256: c3d21d9f39d278857452de002e2d9c45a0b214f3e54fd5bc246b56a8fa0c3c3b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.com/wb?keyword=learn%20tamil%20through%20english%20pdf%20free%20download`. This URL is presented within the document body as a lure for a free PDF download. The document also contains a link farm heuristic, indicating a large number of external links, many of which point to Shopify domains, but the primary malicious link is to the ttraff.com domain. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=learn%20tamil%20through%20english%20pdf%20free%20download In PDF document text
    • http://files.samanthapilates.com/uploads/1/3/0/7/130775116/a4ad42e0697e.pdfIn PDF document text
    • http://files.rayzimmermanauthor.com/uploads/1/3/1/4/131411896/zilulabasazid.pdfIn PDF document text
    • http://files.1stmiddletonscouts.com/uploads/1/3/1/3/131384470/rapixevinetome.pdfIn PDF document text
    • http://jetede.napashuttlelimousine.com/uploads/1/3/1/0/131070872/495652.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/tezolafetimotetuxubaziwus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/xerirazabulikotos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6725/1615/files/past_simple_and_present_perfect_exercises_elementary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2381/0211/files/koleberodakikaboge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/69660816922.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/xobujezivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/rivaxivemobitonabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/75312864261.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3752/2080/files/critical_thinking_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1625/5645/files/centrifugal_blower_theory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/amulet_book_8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/88620202575.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/hyundai_avante_2020_user_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00008799.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8799 19200 bytes
SHA-256: 4050f9d6fdbda82e8354ccb1c8c61258901373bab16b3104bf514c7c62ec8a84
font_00_sfnt_off00007579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7579 5372 bytes
SHA-256: b2df3fa6f0aa1dafebf786f68eb1d4f3f0e32fa31f6048771c8a95303c4d108f
font_02_sfnt_off0000b0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D5 10368 bytes
SHA-256: 9de17bad2a49cb563e35cf2a6dccb344fa9862346d4286e04b843eab8ed0ea6c
font_03_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c