Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab7759eba980305…

MALICIOUS

PDF

57.4 KB Created: 2020-08-01 21:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32ea2414743c2de3058f6c30532bda7a SHA-1: bc63759a599858966482ebe1a92103bc2cb225a6 SHA-256: 8ab7759eba980305f8f9a1a082c4f5843137691e06c98fd92ddc7580e204af40
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating it is a malicious redirector and part of a link farm. It contains numerous embedded URLs, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains URLs and text related to 'Kansas county abbreviations', suggesting a lure. The primary attack pattern involves directing users to malicious infrastructure through a large number of embedded links.

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=kansas+county+abbreviations
    • http://files.olivetteinbloom.org/uploads/1/3/0/8/130873708/8fef9a769c.pdf
    • http://files.makingmathmiracles.com/uploads/1/3/2/6/132682684/6389922.pdf
    • http://files.wesofdes.com/uploads/1/3/2/8/132815054/pasiralapuvel.pdf
    • http://files.shop-phe.com/uploads/1/3/1/4/131455198/zenunavu-towawelef.pdf
    • http://files.emilybridghamportfolio.com/uploads/1/3/1/1/131164402/bb500aaace4.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1532/files/kibosapegijok.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/26488276346.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/jikabobililofona.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/nejamixelojuponiraj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/24798309502.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/98654926963.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/fopafikutujogagaxubelekil.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/nuriwegixonumigasiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/60340489061.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/jafajexunamijovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.pdf
    • https://cdn.shopify.com/s/files/1/0433/5576/6942/files/pewujodugivamifek.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/47917899250.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/lolifuwojibanu.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_off00009e76.bin
66dc4743f46835b5872a6dbbc0c1bd19e146290959371cac332f5b49531230c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E76 5032 bytes
font_01_sfnt_off0000afb3.bin
12e3047305611fd3925be61b213003638e6d24dbe077c8c5ad24adab108e59dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB3 12872 bytes

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