Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c54f9618c336489…

MALICIOUS

PDF

41.8 KB Created: 2020-07-08 21:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 134ac4b2cedad34da79f6b6fbfaf6c81 SHA-1: ec5bb61f820cc98c66e7dc58eaf607e26aae4e07 SHA-256: 0c54f9618c336489a6f3d82927347c4f2df20f4d238e784d8b74a2baee063e95
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains numerous links to external PDF files, presented as search results for free book downloads. One of the primary links directs to a known malicious redirector, indicating a phishing or SEO spam campaign. The document body itself contains garbled text alongside the malicious URLs, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=geochemistry%20books%20pdf%20free%20download
    • http://files.harrydolan.com/uploads/1/3/0/8/130814785/powufu-nuregex.pdf
    • http://files.mycountyparks.org/uploads/1/3/0/8/130813516/molavudo_kudipuworizu_sojiguxexe.pdf
    • http://files.sunreyes.org/uploads/1/3/1/4/131483440/3158915.pdf
    • http://files.evolveastrology.com/uploads/1/3/1/4/131409508/a6526042ad.pdf
    • http://files.rosecitythunderbirds.org/uploads/1/3/0/9/130970014/8779069.pdf
    • http://files.wekeepyoumotivated.com/uploads/1/3/1/3/131380001/pidadil_zutateju_kigukezavik_totejo.pdf
    • http://files.horsesbyelliehesse.com/uploads/1/3/0/9/130969386/pexuz.pdf
    • http://files.neilltimberland.com/uploads/1/3/1/3/131398246/010fd8bf.pdf
    • http://files.heatherseagraves.com/uploads/1/3/2/3/132302774/nufigidoruz-reverime-mojavo.pdf
    • http://files.mizpah36.org/uploads/1/3/1/3/131379045/6624586.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nebosevali.files.wordpress.com/2020/06/rosuxofas.pdf
    • https://tutinofokuke.files.wordpress.com/2020/07/89742777294.pdf
    • https://seleluf.files.wordpress.com/2020/07/62889064894.pdf
    • https://vakaximez.files.wordpress.com/2020/06/daxowuwutomimepore.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75904593322.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.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_off000065a8.bin
03f5ee887969b3a55d7c68cef174cbcbdb006f497bf2e4802eaa98d8fac83fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A8 5612 bytes
font_01_sfnt_off000078a6.bin
ea33b3a44d9911b279316b3594e8c7f2a5e3ea486da4f4aee3caf51cd3798731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A6 9764 bytes

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