Malicious PDF — malware analysis report

Static analysis result for SHA-256 286f353e204a81b2…

MALICIOUS

PDF

58.7 KB Created: 2020-08-11 05:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e714cdb5d0aff827a9f4e8f71c358ee7 SHA-1: 8e59dbec57335bdfe394f93765ca89c0bc1c6a66 SHA-256: 286f353e204a81b25c4876515a04dd8fe7ef97c78a707dfe3c7e940fa52f5007
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=accents+in+french+pdf'. Another critical heuristic identified a PDF link farm, indicating a large number of external links, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL, suggesting an attempt to drive traffic to malicious sites under the guise of providing PDF 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.ru/pify?keyword=accents+in+french+pdf
    • http://files.5ivezero.com/uploads/1/3/1/4/131437538/boxuzuzege-jamov-susaxozokusonir.pdf
    • http://ziwumu.nataliaelder.com/uploads/1/3/0/8/130814017/bupowozisagad.pdf
    • http://files.ansfun.com/uploads/1/3/1/8/131871740/runowagekegapoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6598/2632/files/phonetic_alphabet_police.pdf
    • https://cdn.shopify.com/s/files/1/0437/5327/5546/files/75139407111.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/goziwir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/1366006073.pdf
    • https://cdn.shopify.com/s/files/1/0436/1283/1907/files/17195210400.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/bemekiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/zixega.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/gomorap.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/xenunifawirikedam.pdf
    • https://cdn.shopify.com/s/files/1/0435/9425/2456/files/50921813610.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/23015535330.pdf
    • https://cdn.shopify.com/s/files/1/0434/1678/0956/files/among_and_between_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/hp_officejet_pro_8500a_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/fopugajimivaluvuwebesox.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_off0000860c.bin
41fbcf4e47335c970a28061df7191bc0dedce3de4537b7f43d1b56e1a2a030dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860C 4668 bytes
font_01_sfnt_off000095cf.bin
4f13bf9008d97b8899fb86f6b176dc46a91490ed03c0b46fb4496c13e2964100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95CF 10780 bytes
font_02_sfnt_off0000bacb.bin
02d633d18b4efb222d06cb19cffeedd67924a627ef45dadcb57719ff17a75919		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBACB 16092 bytes
font_03_sfnt_off0000cf88.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF88 4324 bytes

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