Malicious PDF — malware analysis report

Static analysis result for SHA-256 8441171a5eac5459…

MALICIOUS

PDF

41.6 KB Created: 2020-08-23 21:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4965899b4918f32fac03c3df8e237a11 SHA-1: f6f31da6570174540317a1947b4863c8665918ff SHA-256: 8441171a5eac5459d26bf4e96da7715c82c34514564ade701d409d38339a6f42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The embedded link farm further suggests an attempt to manipulate search engine results or distribute malicious content. While no scripts were directly extracted, the PDF structure and heuristics indicate malicious intent, likely to redirect users to harmful sites.

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=airplane+images+free++for+mobile
    • http://files.flurryoffun.com/uploads/1/3/1/4/131453194/8155993.pdf
    • http://files.athenscountyantiquemachineryclub.com/uploads/1/3/2/6/132681954/4605497.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/kezet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9583/4280/files/87418372717.pdf
    • https://cdn.shopify.com/s/files/1/0438/5944/3862/files/19436801031.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/67892792599.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/96018297459.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/fezoked.pdf
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/50473198599.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3186/files/jazz_guitar_music_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/99666592961.pdf
    • https://cdn.shopify.com/s/files/1/0432/2089/3851/files/jotamejekolanuvoxaxuron.pdf
    • https://cdn.shopify.com/s/files/1/0436/5703/5929/files/tamil_christmas_songs_mp4_free.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_off00006451.bin
d5b41cd3da99b8461c6b0091e34acc36d9ed919c3e161d0e60a9aa05e5ca2a31
pdf-font-stream PDF embedded font (sfnt) at offset 0x6451 5348 bytes
font_01_sfnt_off0000765f.bin
e2b4cd83d86169f2e3e3fef49441bafc9368be0b2989afc9879f6cf96d121b04
pdf-font-stream PDF embedded font (sfnt) at offset 0x765F 10420 bytes