Malicious PDF — malware analysis report

Static analysis result for SHA-256 1925639bec223e2d…

MALICIOUS

PDF

41.4 KB Created: 2020-08-21 20:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9efc1af555627052c7789c683ceaf58 SHA-1: 584b1dd9c5d177bae8317e4f30b99053bb75758c SHA-256: 1925639bec223e2d2d65ff5015fba13b0e6136449f135b5fd9f314285b15a7fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for distributing malware. The document body and embedded link farm suggest an attempt to disguise malicious links as legitimate content, likely for a phishing or scam campaign. The ML classifier strongly indicates malicious intent.

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.com/pify?keyword=candy+crush+jelly+saga++uptodown
    • http://files.davenportkartway.com/uploads/1/3/1/8/131856772/759cb.pdf
    • http://files.middlevillemuseum.org/uploads/1/3/0/8/130874394/bogiwafu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/fapodivabamesopisezizezok.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/mazizajeduj.pdf
    • https://cdn.shopify.com/s/files/1/0443/0387/6252/files/vonulipixaxuxuta.pdf
    • https://cdn.shopify.com/s/files/1/0446/3896/1827/files/sigisonalinikalazavisap.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5750/files/pupozizesazeboju.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/6458498706.pdf
    • https://cdn.shopify.com/s/files/1/0463/4971/3569/files/12013393019.pdf
    • https://cdn.shopify.com/s/files/1/0433/3980/8922/files/shoulder_impingement_exercises_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/15275302434.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/jovusosiduxid.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/shambhu_sharane_padi.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_off00006395.bin
dcaf20895d13db749f452be9983b27a11d0fa639b3dcb7d086d3fa5c88564cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6395 5508 bytes
font_01_sfnt_off00007663.bin
d0ebca59f8235b10e87932618bb912f99f73c6e48b18171129065c9576fa091e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7663 10144 bytes