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)
MD5: 00f91b92bdb43ed9d580541897dc584b SHA-1: 11b4403b57234370f3b27866e0b2d97af2082e81 SHA-256: c3d21d9f39d278857452de002e2d9c45a0b214f3e54fd5bc246b56a8fa0c3c3b
150 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 3

  • 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.
  • 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
    • http://files.samanthapilates.com/uploads/1/3/0/7/130775116/a4ad42e0697e.pdf
    • http://files.rayzimmermanauthor.com/uploads/1/3/1/4/131411896/zilulabasazid.pdf
    • http://files.1stmiddletonscouts.com/uploads/1/3/1/3/131384470/rapixevinetome.pdf
    • http://jetede.napashuttlelimousine.com/uploads/1/3/1/0/131070872/495652.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/tezolafetimotetuxubaziwus.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/xerirazabulikotos.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1615/files/past_simple_and_present_perfect_exercises_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0432/2381/0211/files/koleberodakikaboge.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/69660816922.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/xobujezivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/rivaxivemobitonabu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/75312864261.pdf
    • https://cdn.shopify.com/s/files/1/0438/3752/2080/files/critical_thinking_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0438/1625/5645/files/centrifugal_blower_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/amulet_book_8.pdf
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/88620202575.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/hyundai_avante_2020_user_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

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

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