Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedebca2fa972bbc…

MALICIOUS

PDF

49.8 KB Created: 2020-08-08 11:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31918e0947aa40fa64743cdffcaca8f3 SHA-1: 985b377ab7cb267aa7a60be3294d635549ee202f SHA-256: cedebca2fa972bbc8d608f0a904beed362629b7aad54586b4259ecd807ea1d01
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on these links, which likely lead to phishing pages or malware downloads. No scripts were extracted, but the PDF structure itself is the vector for the attack.

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/wb?keyword=wilcoxon%20test%20example%20pdf
    • http://files.designmybusiness.us/uploads/1/3/1/0/131070356/4875503.pdf
    • http://files.davidpapo.com/uploads/1/3/0/7/130775045/tawavijotamuxi_dedipetibode_sigipo_gezuvumuvomawal.pdf
    • http://files.studioremy.com/uploads/1/3/0/7/130739379/5464205.pdf
    • http://files.htecauto.com.au/uploads/1/3/0/8/130873851/8718362.pdf
    • http://sojem.prrunningcoach.com/uploads/1/3/0/7/130775129/ladukaxex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/files/25026077854.pdf
    • https://cdn.shopify.com/s/files/1/0435/5804/3797/files/kg_to_lbs_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6343/files/85003630550.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/64334993077.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/rigedez.pdf
    • https://cdn.shopify.com/s/files/1/0428/2122/2567/files/john_deere_lt180.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/zebalifixetoka.pdf
    • https://cdn.shopify.com/s/files/1/0440/7489/3477/files/xutokuzuvubobemixurusupuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0929/files/zomopoduvuwexenevirixilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/87789727139.pdf
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/62315799378.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_off000082ca.bin
ad7ee0cee1063b9f70a58f96682665c33b725d6cb471c415a5c1ac25ef444bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CA 5284 bytes
font_01_sfnt_off000094cc.bin
8d66bd2633c86fb7c748a1cf35bc98761871f5dc58abe3f6e1e01cc19530fd4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94CC 11292 bytes

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