Malicious PDF — malware analysis report

Static analysis result for SHA-256 520a5f16b7cb4171…

MALICIOUS

PDF

45.2 KB Created: 2020-08-07 18:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bf48e839a6df146a810f55c0f46cf49b SHA-1: 7a18f1a35b0cf82327a1ae6a86395e4547f5af80 SHA-256: 520a5f16b7cb417174833255503232d8abff92507b76eeba774a44661d0bd6df
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains the URL 'https://ttraff.ru/pify?keyword=research+problem+statement+pdf', which is flagged as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious sites.

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.ru/pify?keyword=research+problem+statement+pdf In PDF document text
    • http://files.highlightgroup.com/uploads/1/3/1/3/131383953/9645581.pdfIn PDF document text
    • http://files.areaokc.com/uploads/1/3/0/8/130813851/530db.pdfIn PDF document text
    • http://bogosi.boldcareercoaching.com/uploads/1/3/1/3/131379833/694e9cf1e7a91a.pdfIn 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/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/42543305947.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0438/5686/files/93576416238.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6957/0198/files/pexenowawiwipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1760/9122/files/60824212870.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8309/4434/files/72630308820.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1194/6134/files/robijitaxisuvuzofu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/nagabuxagora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/7129117134.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/velexerisiwenomewuvufiwed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1961/4882/files/vigokedejesib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8897/3729/files/a_level_mathematics_past_papers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000647f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647F 5284 bytes
SHA-256: 81cf8dc62f5668fe1d94aaa23d5dfcfa89a68b4c5cd2b0cc15621af2be5c85ab
font_01_sfnt_off00007640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7640 10380 bytes
SHA-256: 7f61ca7dd9f8cf4ba15c53932f9126f5609e4e0d9b6bed9686a2ebb304fe77a8
font_02_sfnt_off00009997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9997 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361