Malicious PDF — malware analysis report

Static analysis result for SHA-256 d121035aa1e1cfc5…

MALICIOUS

PDF

43.0 KB Created: 2020-08-07 21:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef64ecf39b8c43b2610dc4ff9712a82d SHA-1: d3594bd8537dfe22448db700811674751dd23b1c SHA-256: d121035aa1e1cfc56d1378f335e88c4cb9bda144c9b53ca1f5817be20b83f570
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is part of the lure. The document body, though heavily obfuscated, contains the text 'Beginner s guide to weightlifting pdf' and the malicious URL, indicating a social engineering attempt to trick users into clicking the link. No scripts were extracted from this sample.

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=beginner+s+guide+to+weightlifting+pdf
    • http://files.stacystories.com/uploads/1/3/1/4/131409677/bilurubuwi.pdf
    • http://kaxifeza.joeyessmaracing.com/uploads/1/3/0/7/130776445/xamibopalawid_wurelufepiro_wiruvazutejotix_bumagilin.pdf
    • http://files.carmonaconsulting.com/uploads/1/3/1/4/131483154/a2a837e.pdf
    • http://files.binerd.ca/uploads/1/3/1/3/131379732/000c9492.pdf
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/xusegeke.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/65727610398.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0428/6654/0711/files/kamapepuzevalulol.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/rafitovowegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/67066259586.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/xuvus.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/21631160760.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/nixuke.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/67419499066.pdf
    • https://cdn.shopify.com/s/files/1/0429/1254/6975/files/fozeridivawibibigeruz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/fuwejelaxananun.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/printable_calendars_2020.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_off000069de.bin
b4bb241db6ea5b6d6c12acf1dfff1b788c74daff9e3e4392ca9efafb58e2b36f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DE 5232 bytes
font_01_sfnt_off00007bc5.bin
58e6285d288dce5b5d045d0d0137a73b3b47598524d76c792552d4b3585d65f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC5 10256 bytes

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