Malicious PDF — malware analysis report

Static analysis result for SHA-256 90426e0923871ba2…

MALICIOUS

PDF

52.5 KB Created: 2020-08-20 14:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0a6e92c02bb5f474ee7b895266ac713 SHA-1: c0bdd43c22c1501c3f8b6a3ebfe987baac7bc61d SHA-256: 90426e0923871ba230613d0f9ec70fee15acf775e58a418ce51fc320ca523b59
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 at 'ttraff.ru'. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=forma+1+bahreini+nagyd%25C3%25ADj+2018
    • http://jamobozi.fivelevelsconsulting.com/uploads/1/3/2/6/132682327/javonopaxe.pdf
    • http://files.privatetourssanfrancisco.com/uploads/1/3/0/9/130969818/xeguzo_falusix_verilupovumisaf.pdf
    • http://files.subtleawakening.com/uploads/1/3/0/7/130775758/c9c3d.pdf
    • http://files.markneeley.com/uploads/1/3/0/7/130775023/nevowefawunamudalag.pdf
    • http://files.kellyjoboland.com/uploads/1/3/0/9/130969708/lusamuba.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/54532640650.pdf
    • https://cdn.shopify.com/s/files/1/0430/7612/4821/files/aschenputtel_sketch.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/rirurevitulavopew.pdf
    • https://cdn.shopify.com/s/files/1/0439/3893/9048/files/ielts_writing_task_2_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/rumakotetenoxodewak.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/wow_classic_small_flame_sac.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/99012142734.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/fogamosunaxakakawipigoge.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/mga_bayani_ng_pilipinas_at_ang_kanilang_talambuhay.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/43132414833.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/diablo_3_secrets.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/dobarevodubutobozuget.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/305869957.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006336.bin
960be24e41903e2c9ee1a53646adac9b94dd6a5b6743d5e0f11d54c2ff8ab323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6336 6740 bytes
font_01_sfnt_off0000740a.bin
811bbe4eb9af9331898a13b889ec0c14aeabd17211e9350991e0e25979202fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740A 5876 bytes
font_02_sfnt_off000087fa.bin
39313a1dc1f4fb1359027e0d1c1122c888f819f697073a2b4c23a030396ebaa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FA 11936 bytes
font_03_sfnt_off0000adc3.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADC3 16036 bytes

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