Malicious PDF — malware analysis report

Static analysis result for SHA-256 907e76d2672bffd2…

MALICIOUS

PDF

39.5 KB Created: 2020-07-30 07:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3942eb6d3c2f4f970a5496654a4c97aa SHA-1: 6274b2d867dc4a0711e88f4b95e1eb46430803ac SHA-256: 907e76d2672bffd232bda819f0381a635c37bfd532a20fe7842f2c5b46e917f7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, with one critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=physical+science+pdf+workbook'. Another critical heuristic indicates a PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0432/4818/9603/files/tutivawo.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'physical science pdf workbook', suggesting a lure.

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/pify?keyword=physical+science+pdf+workbook
    • http://files.thrivinginclusion.com/uploads/1/3/1/0/131070799/1199709.pdf
    • http://files.angelfacejewellery.com/uploads/1/3/2/7/132712222/setebapuxe-vefeke-magulilobuj-monazofisikef.pdf
    • http://files.willemwillems.com/uploads/1/3/1/4/131407315/gaket_lufuvejopo_fufarowitifife_zobosotim.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/tutivawo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2642/1672/files/powajedunusirawiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/girotimovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/39948766658.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/66430885059.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0920/files/83809370400.pdf
    • https://cdn.shopify.com/s/files/1/0438/1143/8752/files/97564335246.pdf
    • https://cdn.shopify.com/s/files/1/0429/5943/7975/files/57251589214.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/puwuvubivuvedesenak.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/13935816222.pdf
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/wumilaxuto.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/texilosazogipugazelipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2016/files/pebatetevizesawanavuki.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d22.bin
f60c931e7ee023d5cdca2c35b932528ba8e89f99847e1b554065e5a8bb394b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D22 5352 bytes
font_01_sfnt_off00006f42.bin
4fd171ffdbd98178a60be79923e0da27f022a0e2d687b54b5580b661b783b355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F42 9864 bytes

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