Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb2ab1ca1ec90a0…

MALICIOUS

PDF

36.5 KB Created: 2020-08-21 00:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d954d97b50291554eefba3ddca11df61 SHA-1: c0f805d2194d2a0e830722121393a3aa48b93105 SHA-256: feb2ab1ca1ec90a02ed3c52f677d498130d32f185383ce4c11fe8c5f980ad0cf
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This indicates a link farm or redirection tactic designed to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign. No scripts were extracted, so the exact payload delivery mechanism beyond the initial redirect is unknown.

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=biblia+de+referencia+thompson+rvr1960+pdf
    • http://files.littleacornsharlow.com/uploads/1/3/1/1/131163904/fafivalorubuwujubuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14490041284.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/torikigotajuluduvewoniw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2050/files/74934202401.pdf
    • https://cdn.shopify.com/s/files/1/0440/8279/0552/files/legendary_markings_feral_heart.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3816/files/71137010908.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/bimadobasevatizubitojes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/viwojumawinejotemokuvoxaj.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8680/files/linukekulebow.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/nemoxagiwutamixopetitom.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/apnealink_report_results.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/dowuxukinijevofosov.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/91774106328.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/miluzikazedivujakinedub.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_off00004d24.bin
e72c3366160e6492c4c6efe92e2addeaee1f7e573af19c0c2979af38fd9b4d70
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D24 6148 bytes
font_01_sfnt_off000061d6.bin
e0eba0f41840341527112288e1c07177363ce53cb11a17ef15e8265b80a771be
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D6 10224 bytes