Malicious PDF — malware analysis report

Static analysis result for SHA-256 12522679469dd5f5…

MALICIOUS

PDF

45.1 KB Created: 2020-09-09 05:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9bdd5a6b7b3b507f38e68226c4ba565 SHA-1: 5d8f54e665f1718f5265fd8a72316ac264fc0f2c SHA-256: 12522679469dd5f5279cb1554014d74c33f7d3e40c0df0796f55147fc9aa82be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.me'. The document body, though heavily obfuscated, contains the same URL and references a topic about adding AdMob ads to an Android app, likely as a lure. The presence of a large number of external PDF links also suggests a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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.me/pify?keyword=adding+admob+ads+to+android+app
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/011e4b_6ed1ff25103a4c15919b34fdb0c83a1c.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_3c8b7edc7280480e97687019635eff46.pdf
    • https://static.usrfiles.com/ugd/086daf_13ad94373fe740f7aa1e9ed24f28d468.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_48859fd728774501be91d5226b5c1af0.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1571/files/11432107460.pdf
    • https://cdn.shopify.com/s/files/1/0436/5385/7433/files/jevuxigagolada.pdf
    • https://cdn.shopify.com/s/files/1/0437/2286/6842/files/hip_abductor_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0466/2840/5413/files/bore_borderlands_2.pdf
    • https://static.usrfiles.com/ugd/952c2e_690b0cc0451c4bf782396b43a0dabc77.pdf
    • https://static.usrfiles.com/ugd/a43ec6_c46994b16c9f48c9a75e6f1815d1100c.pdf
    • https://static.usrfiles.com/ugd/2e79a6_2cafbe83011c42c6ae7d7f0aa66e8776.pdf
    • https://static.usrfiles.com/ugd/b30cf0_d8ad4eeebe134bf0a27c16a48f95a237.pdf
    • https://static.usrfiles.com/ugd/270e53_c23d684f99b4420babfb781ebb756159.pdf
    • https://static.usrfiles.com/ugd/baef12_66e8c70e30ca403382ea573166601528.pdf
    • https://static.usrfiles.com/ugd/88a84f_dd84f2aa80824b6ca557070fe3c19ac4.pdf
    • https://static.usrfiles.com/ugd/6350c7_f0bc1cbaec64436bb1653b8b347bac63.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8f2906ae8a04caa8d393c15974df4cc.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_off00006bb1.bin
dea33f2c5c6d3071d66f958df549f75f474d36836f778c030f02d710e37e0c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB1 5376 bytes
font_01_sfnt_off00007ddd.bin
99e1609894a8349bbefcec461491d5d07976519d0d5487c3a512728e7cd7b4b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDD 12812 bytes

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