Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf921e2321d4648…

MALICIOUS

PDF

40.4 KB Created: 2020-08-03 09:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50b94c29da3c999c1c13e01fab293153 SHA-1: 00c487f393d2af46dbb632b9ce393696a9e75bf7 SHA-256: 0bf921e2321d4648f0c89529726429c0f5512b04082f5ea280a2c52fed86b020
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=one+republicgood+life+lyrics, is identified as a malicious redirector. The document body also contains this URL, suggesting an attempt to lure users into clicking it, likely as part of a phishing or scam campaign. The ML classifier strongly supports the malicious nature of this PDF.

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=one+republicgood+life+lyrics
    • http://files.jacobspolitics.com/uploads/1/3/1/1/131164473/ffa782301cee64.pdf
    • http://files.nicholeleavy.com/uploads/1/3/1/4/131452804/25da3edcb469d.pdf
    • http://files.blueribbonkennels.ca/uploads/1/3/0/8/130814636/lunipesesopur-tevuxaziru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1729/0407/files/nixuxalorajabarafale.pdf
    • https://cdn.shopify.com/s/files/1/0431/6951/3632/files/12159745890.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/mozagavurik.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/suzofapavirorabewalabapix.pdf
    • https://cdn.shopify.com/s/files/1/0438/2025/3344/files/rakitisixelugerobixukizaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/66953593167.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/84626149780.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9448/files/81361607108.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65233410578.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/44115954738.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/kinuvunesubalunekonizuri.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/tuwes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/xepapuz.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_off00006003.bin
10e7c27870e322f37cbfeab4739f2a78b40fa0453ffb1ac32063c01797961ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6003 5384 bytes
font_01_sfnt_off00007262.bin
f42f3f77958e8d866814e2056fe927e3104ca6422732df90e1f66c575a1c70d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7262 10160 bytes

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