Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4ed7a4639adf77…

MALICIOUS

PDF

53.6 KB Created: 2020-08-12 04:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f51f3f91628633e7aed5eb3de890de2e SHA-1: 3c1e9da4950bd252f877e15039f9d6e215cab565 SHA-256: 4f4ed7a4639adf776ed562ea9eeaadceb1a51fb6b85af8ff7c4bcd1c702a5d99
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=braveheart+partition+piano+pdf', which is also flagged as malicious. Additionally, a large number of external PDF links were found, with many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=braveheart+partition+piano+pdf
    • http://files.uniquecelebrationspartiesandgifts.com/uploads/1/3/1/3/131379312/redafomudabuj.pdf
    • http://files.vegasvalleycpr.com/uploads/1/3/0/7/130776276/03249808.pdf
    • http://files.bealegacybuilder.com/uploads/1/3/1/3/131379443/0a5a4b52b.pdf
    • https://cdn.shopify.com/s/files/1/0454/7385/7686/files/98034835157.pdf
    • https://cdn.shopify.com/s/files/1/0429/3938/3971/files/wolfram_alpha_series.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/rirabikurelupunovanavibon.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3258/files/7415755502.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/63228385392.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/70968094725.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/29350873855.pdf
    • https://cdn.shopify.com/s/files/1/0434/3365/6476/files/jotesesojanebefe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4469/9288/files/endodontics_principles_and_practice_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/jopuperobos.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7133/files/46273603245.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000550f.bin
0fb21e7d4f79974aeea9b527b700a7722cd5d15e28bfd681f90954449ce159cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x550F 20376 bytes
font_01_sfnt_off0000942d.bin
b235851ad7479a7501d35f161135f8232a5243d03e3e3a699372ae09fc102c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x942D 5028 bytes
font_02_sfnt_off0000a54b.bin
f7afd74c2c5003c52b1d85be23eb61bc98bcf3f7ac18945eccd019520ef9a8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA54B 10388 bytes

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