Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9249d5275384e06…

MALICIOUS

PDF

38.2 KB Created: 2020-08-14 08:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 176c6d1724744eef7456372583aa559b SHA-1: 15135f4989f4fa40aff1732359f1b50b459589cb SHA-256: b9249d5275384e06e998f4c3519a97a43d7d73a209c7801fc901574e2416cc09
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be malformed or heavily obfuscated, but the presence of the malicious URL and the link farm heuristic indicate an attempt to redirect users to malicious content, likely for SEO spam or phishing purposes.

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/wb?keyword=tescoma%20president%20manual
    • http://files.jonathan-emerson.com/uploads/1/3/2/6/132683165/libajude_xofepogenimiv.pdf
    • http://files.nirvanatails.net/uploads/1/3/1/8/131871849/484192.pdf
    • http://nipetuxu.balcairnstockfoods.co.nz/uploads/1/3/0/8/130815009/5965115.pdf
    • http://files.greatlakesrotarypets.org/uploads/1/3/1/4/131409526/bagobonezikupipesilu.pdf
    • http://fezajuki.themeetingplace-cafe.com/uploads/1/3/1/3/131398134/meneliwokoku.pdf
    • https://cdn.shopify.com/s/files/1/0436/7784/3609/files/dexifuwefejulopegobebefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9970/files/86192324340.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kovogosiwe.pdf
    • https://cdn.shopify.com/s/files/1/0450/2568/9758/files/automobile_technology_by_nk_giri.pdf
    • https://cdn.shopify.com/s/files/1/0432/1830/5179/files/6763165442.pdf
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/12684111483.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/9902578856.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/wowaduvisugorumixisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/nevapafepanazub.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/10463772107.pdf
    • https://cdn.shopify.com/s/files/1/0430/2431/8618/files/the_abc_murders_agatha_christie.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5545/files/ray_achievement_motivation_scale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b4d.bin
da4210f82631724e3be1487cde5921119fc19b8c97000aea10da049f6603adc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4D 5048 bytes
font_01_sfnt_off00005c4f.bin
4874371a21bc4efb6c443928fd01f8b21be63176c46e1b55d389d1cd52474678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4F 9864 bytes
font_02_sfnt_off00007e32.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E32 4324 bytes

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