Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae79e0b59265ee66…

MALICIOUS

PDF

42.4 KB Created: 2020-08-04 20:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f375bc5a615f8d8fe3d9b17550ad057d SHA-1: dd570e68971b397b62cfd395d0b65e02fb338a71 SHA-256: ae79e0b59265ee66d170180a0f1cdd54c0650197cfd8b9c2b96ff52a91fe69cb
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link to `https://ttraff.ru/pify?keyword=accountant+duties+pdf` is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for accountant-related duties. The presence of numerous PDF links suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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=accountant+duties+pdf
    • http://bovuju.sammileedavis.com/uploads/1/3/1/4/131482853/8310986.pdf
    • http://files.reddeerplayers.com/uploads/1/3/0/7/130740625/5672ad913ff87.pdf
    • http://files.stiknstop.com/uploads/1/3/0/7/130738637/minurifuxaduwif.pdf
    • http://files.loosechangequintet.com/uploads/1/3/0/7/130775033/7009851.pdf
    • http://files.rlmgc.net/uploads/1/3/1/3/131383478/9368072.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/migokubos.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/riwemomexavukivelabetotu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/51206748220.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/berozebulaba.pdf
    • https://cdn.shopify.com/s/files/1/0443/0397/4556/files/radio_rossii_chita_32_aac_radio_logo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8933/8276/files/74099427541.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/vijabafagedisepagis.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0071/files/99842492180.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3943/files/90926182299.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4396/files/peranafekixob.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4979/files/31142062203.pdf
    • https://cdn.shopify.com/s/files/1/0432/0198/6723/files/35632312182.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_off000069a8.bin
0f988beabca46483a295065dae759b1154fc7078bd3cb098d40c3a1345d8885d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A8 5012 bytes
font_01_sfnt_off00007ad1.bin
8fb2b71df2a43db435dedf63ab92ce06a334b785bed843e87f2ee5845641653e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD1 10040 bytes

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