Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dcd4d0eca3fe4a…

MALICIOUS

PDF

47.3 KB Created: 2020-08-24 11:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fd9f53f4b262793e1f154d689dcf1a52 SHA-1: 63d2744b967fc903959a3387c2d774f231a82d7f SHA-256: a4dcd4d0eca3fe4a7eba47ac0564af778eedb50f15430dd8b98088457e86b2cc
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a link farm with numerous external PDF links, many hosted on Shopify. The document body, though partially garbled, contains text related to 'Send anywhere app' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of urgency language further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=send+anywhere+app+iphone+to+android In PDF document text
    • http://files.zeitzoff.com/uploads/1/3/1/4/131438109/gunufojeninafox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/mathbitsnotebook_geometry_practice_test_2_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/22381414569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6738/3713/files/pupudepate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6211/7031/files/23524821980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/cardiac_cycle_ncert.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/diabetes_mellitus_2_treatment_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/vekirawafevib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/2536/7975/files/nerimadamarakubefixila.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9649/0663/files/85130991849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/7771486033.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 3

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_off000079ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79EC 5132 bytes
SHA-256: a79a2c3d6379854a8e9a814421e67d484bfd38ab91497ed333d01c31e9b45aab
font_01_sfnt_off00008b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6E 10748 bytes
SHA-256: dc7b6f1a36e108ff78cccc094f04ef6c476426920d9bb7b1321fa6100523f112

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