Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c90b68944db06f1…

MALICIOUS

PDF

42.1 KB Created: 2020-08-18 15:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f341bb60f9bb996cb675b285ce44d2ce SHA-1: f445467ae7a0d6ecb60d1ff655b3dbbb63b04ed9 SHA-256: 7c90b68944db06f14019c7dd4490f66d0d5da5e67bb371c1758f1d013126bf4a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=big+sean+kendrick+lamar+control'. Another critical heuristic indicates the PDF acts as a link farm, containing approximately 30 external PDF links, many hosted on cdn.shopify.com. The document body is heavily obfuscated and contains what appears to be metadata rather than user-readable content.

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=big+sean+kendrick+lamar+control
    • http://wapikefiv.jarrelltxamericanlegion.org/uploads/1/3/0/7/130775350/8733428.pdf
    • http://files.nerdnotesguides.com/uploads/1/3/2/6/132681164/9187058.pdf
    • http://vikufu.redwoodcoastanimaltracking.com/uploads/1/3/1/3/131379057/399545.pdf
    • http://pebiwo.autumncorners.com/uploads/1/3/1/3/131384260/da87bd642.pdf
    • https://cdn.shopify.com/s/files/1/0435/5738/8440/files/82431018818.pdf
    • https://cdn.shopify.com/s/files/1/0431/9100/9442/files/49173888647.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9619/files/28471204663.pdf
    • https://cdn.shopify.com/s/files/1/0459/1462/0053/files/basketball_diaries_jim_carroll.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/93746878839.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/no_bake_sand_casting_process.pdf
    • https://cdn.shopify.com/s/files/1/0443/4444/3036/files/malaysia_business_law_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/4007/9005/files/18762386262.pdf
    • https://cdn.shopify.com/s/files/1/0438/5108/8032/files/aromatherapy_massage_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/shadowrun_hong_kong_door_codes.pdf
    • https://cdn.shopify.com/s/files/1/0445/9141/5460/files/cattle_breeds.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/sinaxevipebumimij.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_off00006545.bin
813b4448b89fc31a50b6ecaf04588947706d3a0041419c6fe9c1703082b79bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6545 5372 bytes
font_01_sfnt_off0000776e.bin
7b12b8b257178e9216fa357df314e98aaedb44f2ec6c072794664d75377330b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776E 10604 bytes

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