Malicious PDF — malware analysis report

Static analysis result for SHA-256 528ea8fdf444aae1…

MALICIOUS

PDF

41.1 KB Created: 2020-07-10 06:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: d5804cfad06786c8739a14575ab0479d SHA-1: 9b63e911010ca2e677dc175eaf77b87ed454558c SHA-256: 528ea8fdf444aae174f1dbb828fe795efe0288b234e7ae88e1d73495d8ea15bd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs, many of which point to link farms and redirectors, indicating a malicious intent to direct users to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links, including a redirector at 'https://ttraff.cc/wb?keyword=normal%20ultrasound%20anatomy%20of%20the%20musculoskeletal%20system%20pdf', suggests a phishing or malware distribution campaign.

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.cc/wb?keyword=normal%20ultrasound%20anatomy%20of%20the%20musculoskeletal%20system%20pdf In PDF document text
    • http://files.operationhood.org/uploads/1/3/1/4/131406274/pikutodan.pdfIn PDF document text
    • http://files.northwestclubracer.com/uploads/1/3/0/7/130776439/pizajab_kepif_teruga.pdfIn PDF document text
    • http://files.marinovdance.com/uploads/1/3/0/8/130814652/mabutazizi.pdfIn PDF document text
    • http://files.toughbookrescue.com/uploads/1/3/0/7/130739769/wolupidosifebuz_budazebam_lomedugatazuz.pdfIn PDF document text
    • http://files.umichfishing.com/uploads/1/3/1/4/131437823/narikufud_pavoputuko_noxuwavo.pdfIn PDF document text
    • http://files.nicolas-rigaux-photographe.com/uploads/1/3/1/1/131163563/d346a.pdfIn PDF document text
    • http://files.clairepassmore.com/uploads/1/3/0/7/130738915/gejoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://metefodowu.files.wordpress.com/2020/06/11117710302.pdfIn PDF document text
    • https://velamejevar147843807.files.wordpress.com/2020/06/vapapavipewixifutawov.pdfIn PDF document text
    • https://dikuvaza.files.wordpress.com/2020/07/51366752902.pdfIn PDF document text
    • https://zapekijibu.files.wordpress.com/2020/07/40570986971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53262414385.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6456 5364 bytes
SHA-256: 921290095d9108f762fdf7547745c1576369b5bf65668ac0102c5fccc5d399b5
font_01_sfnt_off00007670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7670 9468 bytes
SHA-256: 604b7a93e5824378b03c9d16dea8c7d0f1bb45dc14fc54861ad291b207b0537d

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