Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba7e1b7976b2299…

MALICIOUS

PDF

40.6 KB Created: 2020-08-14 03:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac5ff75fe7c873df3b9397f95e6d6292 SHA-1: a2b54ccab5528eac80f30d6c509d1bcedbe66427 SHA-256: 6ba7e1b7976b22998d9e5065536ea1e6b6184669fe53cf6d47ed664f0e422f67
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded 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 at `ttraff.ru`. The document body, though heavily obfuscated, contains the same URL, indicating an attempt to direct users to malicious infrastructure. 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/wb?keyword=electrical%20engineering%20interview%20questions%20and%20answers%20pdf%20file
    • http://files.teachermrbenson.com/uploads/1/3/1/6/131606262/gegeketupaperir_vajasewedum_vefamutugon_vofefoj.pdf
    • http://zevokeg.thenerdparty.com/uploads/1/3/1/4/131454012/3022c2921.pdf
    • http://files.tockwithjuniors.com/uploads/1/3/2/3/132303081/1b0cda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bekikelazipilexujewa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/gitimeparutu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/jogivabufazegiwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5928/files/lidilejowuvolenaxamigi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/15616406297.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/9635988012.pdf
    • https://cdn.shopify.com/s/files/1/0440/7014/2117/files/10447950429.pdf
    • https://cdn.shopify.com/s/files/1/0450/2405/1358/files/pyrexia_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/munudu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3475/files/4523357543.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_off00006217.bin
910d25b2811b1904045885b32b07e9f914484c286740ce65b8ea37a9f855ba11
pdf-font-stream PDF embedded font (sfnt) at offset 0x6217 5560 bytes
font_01_sfnt_off0000751a.bin
69da8e08a00ae0bb74357e807b74561080ff9350765df4e04ab3119b43592143
pdf-font-stream PDF embedded font (sfnt) at offset 0x751A 9428 bytes