Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e7ecf468b6913d…

MALICIOUS

PDF

69.0 KB Created: 2020-08-06 10:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0797bd253eeffa26df5b52381e20c43c SHA-1: f255ce7bd6876b673487eadf39c38c7a8f9e1a08 SHA-256: b6e7ecf468b6913db00facfb8c8b837e0b484645ca5281a8ce07edb20c525bf4
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic firing indicating a redirect to known malicious infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. The presence of a large number of SEO-optimized PDF links suggests a link farm or content-spinning operation designed to attract traffic and potentially distribute malware.

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/wb?keyword=khalil%20gibran%20biography%20pdf
    • http://files.babeswithbabesfitness.com/uploads/1/3/2/6/132681773/nazumapugam.pdf
    • http://files.lekeapenawriting.com/uploads/1/3/2/6/132683014/fe5ac631f.pdf
    • http://files.automaticdrivinglessonsworcester.com/uploads/1/3/1/3/131379946/lalalewozuga.pdf
    • http://zorajefek.freshenitup.org/uploads/1/3/1/6/131636655/7442652.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/6981/files/jakoxujokupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/negexigifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/78771211091.pdf
    • https://cdn.shopify.com/s/files/1/0429/7873/8335/files/povoxizubodunosuwibanaxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/wipexuvowudirekepide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5765/0584/files/chilton_labor_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56317886700.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/nirewofefofipusifu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/duzejininafeti.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4741/files/rujeved.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/bogafapirulowebelawogum.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_off0000cf1f.bin
f33f9fd8dde3dfc575987d1c43946915ecc074eb73ec278af6d859a4964498ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1F 5336 bytes
font_01_sfnt_off0000e148.bin
a8ca1915208e18444557502efe20cc7735df600caa8dc2136dfcaa81d36ed0fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 11956 bytes