Malicious PDF — malware analysis report

Static analysis result for SHA-256 931cfa0dab976ba6…

MALICIOUS

PDF

33.2 KB Created: 2020-08-15 06:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3847f08d68bc3c36eddfae26598f733e SHA-1: 7b3eef55a8230473b7ad59932bfe329f3ee5b7a0 SHA-256: 931cfa0dab976ba6f8bb7a8da3c4ac0ca860381caf4ebc505b88cb23ac19a1da
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised as nutritional information. The PDF also functions as a link farm, directing users to numerous other PDFs hosted on various domains, including several on Shopify. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be social engineering through a deceptive link.

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.ru/pify?keyword=baker%2527+s+unsweetened+chocolate+nutrition+information
    • http://zosajaze.meanscenecomics.com/uploads/1/3/1/3/131381464/4183c.pdf
    • http://mibuw.mhealthgroup.org/uploads/1/3/0/8/130874359/2ab43b30c34.pdf
    • http://files.bouncehopper.com/uploads/1/3/0/9/130969703/vexelufo.pdf
    • http://kifefudaj.mindfulness-et-sport.com/uploads/1/3/1/6/131637056/5741183.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/sujozu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/9586626653.pdf
    • https://cdn.shopify.com/s/files/1/0430/9424/5537/files/german_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdf
    • https://cdn.shopify.com/s/files/1/0435/2842/1528/files/73558554366.pdf
    • https://cdn.shopify.com/s/files/1/0440/9442/3192/files/oppo_a33f_flash_tool.pdf
    • https://cdn.shopify.com/s/files/1/0432/6821/0852/files/cape_town_convention_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/2444/7638/files/65413355092.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/sbi_atm_debit_card_replacement_application_form.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_off00004423.bin
a581d31628519706e31240482211aacbf39bd90d7f03b7a7e92ed68479b0a245
pdf-font-stream PDF embedded font (sfnt) at offset 0x4423 5500 bytes
font_01_sfnt_off000056bf.bin
f7b42ca1f57ef503ea740b58dc0b934b409fcfc6b3b22012ced5959a679dfb01
pdf-font-stream PDF embedded font (sfnt) at offset 0x56BF 9652 bytes