Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc79831eaf8b2af7…

MALICIOUS

PDF

41.9 KB Created: 2020-08-21 11:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d10ca52a7853879868e678f374397840 SHA-1: 40c20058e6a1e99ce5e1231045632fd2e570377b SHA-256: fc79831eaf8b2af791a181821792baf49a8ec9bbb0719c001f3188c0194e3be1
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The primary malicious URL identified is https://ttraff.ru/pify?keyword=geotextile+bentonite+waterproofing+sheets, which is likely used to funnel victims to further malicious sites. The document body itself appears to be malformed or obfuscated, but the presence of numerous links strongly suggests a link farm or redirection attack.

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=geotextile+bentonite+waterproofing+sheets
    • http://files.thebalancingtouch.net/uploads/1/3/0/7/130739883/5261338.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/70873348526.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5143/files/vafejevofuzewusarekana.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1373/files/rifujefoxemonivozimepe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2620/9175/files/not_a_bad_thing_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0438/6874/9979/files/26792082938.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/48141971703.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/the_world_is_yours_sample.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/best_games_for_low_end_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7780/files/poesias_fernando_pessoa.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_off00006223.bin
267187999788a9389f94a8d1f01522b7e507682e55a90e372aaf73899988cf46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6223 5492 bytes
font_01_sfnt_off000074e8.bin
7c3e8075f046b15b3057a0b714ce4c137813f4176bc29081123add8caec01deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E8 11944 bytes

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