Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e63340ee1d8805…

MALICIOUS

PDF

46.1 KB Created: 2020-08-03 12:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d12b9ab0b3fcb674277f20c6992f8816 SHA-1: 73389bd3e97da3840a5d30edac69d0ebec0aa9ab SHA-256: b1e63340ee1d88059f55fa6952e944a293de50a3de0d1d1ab596d130bb717ec0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm strategy. The primary purpose seems to be to lure users to malicious sites through a deceptive document.

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=algorithmic+and+computer+methods+for+three+manifolds+pdf
    • http://files.flytyingforcescustomtiedflies.com/uploads/1/3/0/7/130776220/92769a87.pdf
    • http://files.duncanleighclassicalguitar.co.uk/uploads/1/3/2/6/132683017/dajewovidagisi.pdf
    • http://files.thanksforeverything.shop/uploads/1/3/0/9/130968950/zemof-ribip-tofividek-mipuvejoguta.pdf
    • http://files.egyptiangift179.com/uploads/1/3/0/8/130874110/kirevu_potakapa_wokozogo.pdf
    • http://files.holyspiritfarmhorsesanctuary.com/uploads/1/3/1/4/131437474/rasopegit-vefisudosude.pdf
    • https://cdn.shopify.com/s/files/1/0438/9090/1144/files/linked_list_c_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/sugaxilabaxo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1155/files/41080066371.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/chst_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/rekeseto.pdf
    • https://cdn.shopify.com/s/files/1/0432/1637/1867/files/89672341584.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89573664631.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fikikotiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/wukalifujidebowifa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6345/files/dnd_3._5e_player_s_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1944/files/16953720670.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/gopinomozijurusiwobug.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_off00004ce8.bin
d41c3458f1a94b204056e525ca483373ff6018abd4bc6867e752496dc80242c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE8 13008 bytes
font_01_sfnt_off000076d2.bin
09ef4f9112815a3f55c565a7dc04c831942d5ca5cbae63b6db5552c96650ef3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D2 5556 bytes
font_02_sfnt_off0000898f.bin
99455fcc6edeaad37cd6c9d33cc28855ff909cb7afb58ebc47b5b43b20574381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x898F 9884 bytes

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