Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d7830b77fe33c5…

MALICIOUS

PDF

48.0 KB Created: 2020-10-30 11:23:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c66a827a97852c1d10bd498cacdaea41 SHA-1: 99257ed506ebc266cf2099fcfb57f5e15e1c11c3 SHA-256: 07d7830b77fe33c5577d457cf48663075bc7653b5417770602537c85cd6c6721
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and other links to external PDFs, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

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/123?keyword=the+pit+and+the+pendulum+essay+questions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f92e92300ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f936e96e8aca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/146e8dc2-f620-4749-8f09-a195d7b32340/vumefeterowusumagigejetuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ea4ab0-c5b1-4648-afba-f098e166e58d/76427890549.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5795/5494/files/pro_evolution_soccer_2020_para_android_descargar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1117/3275/files/c_diff_treatment_guidelines_idsa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd71a1e-a36d-4e98-ae96-4d8e8219bcfc/japunevigemitixeserero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddcbd20d-7671-43a2-b83b-14de4220ba33/78416061046.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/34771029247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/7562/5894/files/73288780504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6301/7109/files/havana_tablature_guitare.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D43 5280 bytes
SHA-256: ff37ba50c5361ac944074d4b67a2cae4ecf7b1ce4b92645608ac6e14fdd32d76
font_01_sfnt_off00008f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F17 10784 bytes
SHA-256: 72f3d6a6ebfd7e622ad5101a32971584e226d38c3cacd0f70242c432ba02de98