Malicious PDF — malware analysis report

Static analysis result for SHA-256 887b0415c12d5f36…

MALICIOUS

PDF

35.8 KB Created: 2020-08-16 15:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6ee61e2c86f1ad43ee346a7167fb7f7 SHA-1: 718c816167f2ed2ac4467e2734b879a9743cc2b5 SHA-256: 887b0415c12d5f36a1230fec3adfc897f7aef3738603ae4ace7a12b7529803d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged the document as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to external sites.

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.com/pify?keyword=plastic+deformation+by+slip+ppt
    • http://files.fryingpanequestrian.org/uploads/1/3/0/8/130874347/kegapof.pdf
    • http://files.healthnessxclaralim.com/uploads/1/3/1/4/131483217/d373c76.pdf
    • http://wegijez.wheredothemondaysgo.com/uploads/1/3/1/3/131398140/ranonivirum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8524/2261/files/halimbawa_ng_aksyon_na_pananaliksik.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/equivalent_algebraic_expressions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/zujiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/poxusulijupidokubeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/calicivirus_felino_patogenia.pdf
    • https://cdn.shopify.com/s/files/1/0432/8397/2256/files/95904959822.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/xibisupatenizariruworag.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8936/files/badokizomusesilaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/6296/6937/files/72100698504.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9396/files/vubezevopiribofo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4500/1115/files/anatomy_and_physiology_study_guides.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_off0000509d.bin
3891b5132b27f413c98c12b33218075af20f8c68dfcafd5f08bc543fbcaa1cb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x509D 5544 bytes
font_01_sfnt_off00006353.bin
49e54ebd31b350bc951a723bd7c38b5f49f3f49d0299676e852bfddad0455c60
pdf-font-stream PDF embedded font (sfnt) at offset 0x6353 9376 bytes