Malicious PDF — malware analysis report

Static analysis result for SHA-256 643206694f6a8037…

MALICIOUS

PDF

44.2 KB Created: 2020-09-02 00:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6acb936b0cec00cc1aad7daa1c999098 SHA-1: 968323b75620ca9764460c672dec6270b84ce348 SHA-256: 643206694f6a80375c7ef2e3817be527a780c9210bfcc747edac888d62608fba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for information about Android software. The presence of numerous links to Shopify-hosted PDFs suggests a link farm or SEO manipulation tactic to increase visibility. No scripts were extracted, but the malicious link is a strong indicator of a phishing or redirection attempt.

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.link/wix?keyword=android+version+8.+0+software
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1060/3677/files/vuliwofuniz.pdf
    • https://cdn.shopify.com/s/files/1/0462/1962/4602/files/donor_thank_you_email_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/75292171729.pdf
    • https://cdn.shopify.com/s/files/1/0436/1283/1907/files/17195210400.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/3495145880.pdf
    • https://cdn.shopify.com/s/files/1/0432/0844/2020/files/high_density_foam_sheet_singapore.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/5858129412.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/wusinomuxerajotenilux.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/mathematical_logic_mcq_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/center_absolute_div.pdf
    • https://static.usrfiles.com/ugd/a18aa6_00325feda8204eab9742598eaa554e98.pdf
    • https://static.usrfiles.com/ugd/6f58fb_be79fa0352ac401e9ada935e30ca4c85.pdf
    • https://static.usrfiles.com/ugd/a2e20a_e2bb0b4e5239416ca1fa988c07bd29ae.pdf
    • https://cdn.shopify.com/s/files/1/0432/1456/9631/files/bulgarian_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0457/4923/9964/files/17435495461.pdf
    • https://cdn.shopify.com/s/files/1/0466/3479/5173/files/easy_hard_riddles_with_simple_answers.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e36.bin
4dc0b053d45874e26aa7cae8d0146a4107ecfaf0f8991e988c223e596079c8c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E36 5380 bytes
font_01_sfnt_off000080b0.bin
0d945d13fa965ab26b507e0cfbb5553822c4f6230da63d4f20d9e4e9d0aa3c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B0 10356 bytes

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