Malicious PDF — malware analysis report

Static analysis result for SHA-256 073bddba25d83b06…

MALICIOUS

PDF

41.0 KB Created: 2020-08-19 00:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e800ebe4b61b0a42498157063f6ad2b SHA-1: 2334d7cabaa19468e139eeee7fe605b6634663df SHA-256: 073bddba25d83b062338d9a76a7fe08e0b627ce6ef8b90382f52f20885f4b585
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, disguised as an HMRC penalty appeal letter template. The document also includes a large number of links to other PDFs, likely for SEO manipulation or to obscure the malicious redirect. The ML classifier strongly indicates maliciousness, and the callback lure heuristic suggests a phishing or scam pretext.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/pify?keyword=hmrc+penalty+appeal+letter+template
    • http://pinomu.gracegoesplaces.com/uploads/1/3/1/1/131163953/3723220.pdf
    • http://files.micdropdj.com/uploads/1/3/1/4/131407818/fufivosavaje_bidepidirizit.pdf
    • http://files.binauralbeatsmaster.com/uploads/1/3/0/7/130775786/8857350.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8966/4926/files/blender_3d_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8560/2721/files/migow.pdf
    • https://cdn.shopify.com/s/files/1/0440/4019/2150/files/administering_medication.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/kaala_koothu_1080p_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6502/files/bukibawezemapomolasumum.pdf
    • https://cdn.shopify.com/s/files/1/0430/5944/5914/files/thomas_calculus_11th_edition_solved_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4101/files/48929829275.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/hannah_arendt_biography.pdf
    • https://cdn.shopify.com/s/files/1/0434/2494/0184/files/aws_api_gateway_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/periodic_and_aperiodic_signals.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006524.bin
7b7d3c2520a3bdd0a4d46f9514d80a99fc2adf280a9d3aa8fb6ab709c3442a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6524 4964 bytes
font_01_sfnt_off000075ec.bin
56dc8056f4c47ad7419d0f0eac690935ae3f768e4c9a9341628cbf21691cc5d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EC 9848 bytes

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