Malicious PDF — malware analysis report

Static analysis result for SHA-256 835faa2779f182e2…

MALICIOUS

PDF

44.0 KB Created: 2020-08-06 12:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43adba9fb5ee16c5b95ecf3d15c56aff SHA-1: d6e91ceaf5e7709c8a317f80a853be3962f3e895 SHA-256: 835faa2779f182e28e3f24b341596ec7fc41969043950de511cf348066a89b90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host SEO-optimized PDFs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=air+conditioning+system+in+automobile+pdf'. This suggests the document's primary purpose is to redirect users to malicious sites, likely for further exploitation or phishing.

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.ru/pify?keyword=air+conditioning+system+in+automobile+pdf
    • http://files.shopcafeparis.com/uploads/1/3/1/3/131383319/7952882.pdf
    • http://files.mobilecitynz.net/uploads/1/3/1/1/131164419/raxuwipule.pdf
    • http://files.inspiredbytwoworlds.com/uploads/1/3/2/6/132682787/motunalovewi_jesezuzuk_kupitit.pdf
    • http://jekili.mosaicolearning.com/uploads/1/3/1/3/131383314/tafebovob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/88773241089.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/zuvewenamoresekawaxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2617/6407/files/dissociative_identity_disorder_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/guruxamaxokiwukilawix.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/1_844_776_6275.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1321/files/forge_energy_to_rf.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/19988646666.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/54404930425.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/52766915088.pdf
    • https://cdn.shopify.com/s/files/1/0430/4764/9429/files/noxejirorubovujow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/lowes_livingston_tx.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/guide_to_network_defense_and_countermeasures.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060c2.bin
57365bae54696b9b66a731f3b55b02eaa53e204cb930c750aab82186c7396329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C2 5588 bytes
font_01_sfnt_off000073a1.bin
a1d6a32b6efdd4b26d0a26b9ebaab4803b094ffec099e3ec45705b08d98fb870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A1 9732 bytes
font_02_sfnt_off0000949b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x949B 4324 bytes

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