Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96bd220c83d8b77…

MALICIOUS

PDF

57.1 KB Created: 2020-08-07 16:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11a2ea9502a8ea3f7a29bec0efba5996 SHA-1: 25b22f5dc05144550f47f19aa0b35a8240da7c29 SHA-256: a96bd220c83d8b7775d7f9aff9c364f09256262a01192e8402fadb0b5acd5f59
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.com/pify?keyword=checkers+strategy+guide+pdf', suggesting a lure to a malicious site disguised as a strategy guide. The presence of a link farm further supports the malicious intent.

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.com/pify?keyword=checkers+strategy+guide+pdf
    • http://ferane.johnlahart.com/uploads/1/3/0/8/130873951/9283718.pdf
    • http://files.thestore99613.com/uploads/1/3/1/3/131398428/6098733.pdf
    • http://kuvif.implicitacademy.com/uploads/1/3/1/0/131070767/zital.pdf
    • http://files.oneactioncalendar.org/uploads/1/3/1/3/131383959/5887307.pdf
    • http://vezosupob.h2repairalloys.net/uploads/1/3/1/4/131406893/wusobu-xesodixor-vekirigimorevi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9373/6089/files/kelunivozeloxubafu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/xujuvozajifiro.pdf
    • https://cdn.shopify.com/s/files/1/0447/0390/7993/files/brazilian_portuguese_grammar_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/lifigefakixilotibox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/senim.pdf
    • https://cdn.shopify.com/s/files/1/0437/0127/2729/files/nipisew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0434/9437/5576/files/44787440670.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8279/files/86850173709.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2808/files/rational_numbers_class_8_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/7418/1537/files/refovowul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fa5.bin
63876a2cd4ddcec6c7423e5804e7cf0f31118de7973c12bf1030c677fecbdc7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA5 5456 bytes
font_01_sfnt_off0000b239.bin
1192c66275b3c804d774d96ce9394602c90d5eb601a7db596f9e4376cee66d69
pdf-font-stream PDF embedded font (sfnt) at offset 0xB239 11008 bytes