Malicious PDF — malware analysis report

Static analysis result for SHA-256 18af6664b42e45fd…

MALICIOUS

PDF

38.1 KB Created: 2020-07-16 04:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 136e093321085b6bea8ef956f6f6c471 SHA-1: 1f6c6e9ae0df640ed136ca8ab83d5dc75fda1242 SHA-256: 18af6664b42e45fdb11a5465640d03cd7ec823bf8a26541375e2437bc2949b10
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or content stuffing technique. While no scripts were extracted, the presence of numerous links points towards an attempt to lure users to malicious sites, likely for phishing or malware delivery.

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.cc/wb?keyword=precalculus%20graphical%20numerical%20algebraic%20common%20core%20pdf
    • http://files.thesledshed.net/uploads/1/3/1/4/131406049/5b64d2d6925003.pdf
    • http://files.sawyerscluster.com/uploads/1/3/0/7/130776483/zotiluga.pdf
    • http://files.negrojusticeleague.com/uploads/1/3/1/4/131407698/padub-farep.pdf
    • http://files.eagletheatrecompany046.com/uploads/1/3/2/7/132740614/b44e0.pdf
    • http://files.mineralintelligencecapital.com/uploads/1/3/1/3/131398251/moletosazu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75904593322.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1097/files/31177679734.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://sixuxonudibi.files.wordpress.com/2020/07/47395970130.pdf
    • https://ginopurox574319465.files.wordpress.com/2020/07/lipudagor.pdf
    • https://kezinoniwet.files.wordpress.com/2020/07/bodofisukekadovexedugopuj.pdf
    • https://jobujefebiwo.files.wordpress.com/2020/07/wetalepolube.pdf
    • https://josiwaja.files.wordpress.com/2020/07/85196512027.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/kopuzonozewufujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/86914941126.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/93418495257.pdf
    • https://cdn.shopify.com/s/files/1/0434/8461/0712/files/86401106163.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/lozej.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/mopabemataresop.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1984/files/97119931262.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/2449258440.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_off000056a9.bin
f5fff53cca93b7cb353ea974ef6cb9e7bb64c3a12c94ecba63fc0d1294f655a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56A9 5512 bytes
font_01_sfnt_off00006918.bin
534ed073fad567ccd31f4c150ae0faa2ab7371830e9d2e63452695690ecba148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6918 9748 bytes

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