Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c51aea8fecc04d…

MALICIOUS

PDF

51.2 KB Created: 2020-08-25 16:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecab5120298954668f0f538d5184977c SHA-1: a9c561dcdc7968f1d2858ee9aec2b961a9b20354 SHA-256: f8c51aea8fecc04dcc6b8240500d61979eff13a6bafaab112bcaad0be7b0a27e
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL 'https://ttraff.cc/pify?keyword=alembic+format+maya', which is likely used to funnel victims to further malicious content. The document body contains numerous embedded URLs, including benign ones hosted on shopify.com and a potentially malicious one from xuxibaso.ncautotransport.com, contributing to the link farm.

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.cc/pify?keyword=alembic+format+maya
    • http://xuxibaso.ncautotransport.com/uploads/1/3/2/3/132302815/3374275.pdf
    • https://cdn.shopify.com/s/files/1/0436/1709/1744/files/flitch_beam_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/consciousness_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/98947398311.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/rewidepitirukefulobewanal.pdf
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/guided_bus_tours_of_washington_dc.pdf
    • https://cdn.shopify.com/s/files/1/0430/0914/7043/files/strategy_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6998/9279/files/79891029993.pdf
    • https://cdn.shopify.com/s/files/1/0436/4913/8846/files/allegiant_full_movie_in_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/giwegixovavirika.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bekikelazipilexujewa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/archicad_15_library_objects_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/731407993.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/animasi_bergerak_terima_kasih_ppt.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/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/fi

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c31.bin
d64bb8e1d16854efe86d998a04766120d87ae1c964591f0a879bb3936d26093a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C31 4224 bytes
font_01_sfnt_off00007af8.bin
119f80a8b5a45c60677510f34259980432eb91ff75f42ecfa62520515d082a53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF8 4760 bytes
font_02_sfnt_off00008b24.bin
2d54416b082d8aac53e0a5a5ed64e1900e242d17533d73d64a47caf074679095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B24 10784 bytes
font_03_sfnt_off0000affc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFC 4324 bytes

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