Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d530c76bf182405…

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 15:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 229142bee245ee9ab9fd5eac0f32dcba SHA-1: 1879255678a2876d04aff105400d6522563c57a8 SHA-256: 5d530c76bf18240524af0994598ed66bac1a42d23502624ed1f5c0d7b5693672
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which point to Shopify-hosted files. The document body, though obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=attic+insulation+thickness+guide', suggesting a lure to a malicious site disguised as a guide. 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/pify?keyword=attic+insulation+thickness+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2483/4982/files/3572341134.pdf
    • https://cdn.shopify.com/s/files/1/0437/4659/0872/files/pdf_file_resizer_app.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/45054568666.pdf
    • https://static.usrfiles.com/ugd/8a419d_aa2bd66cc83c4007b5aab99850fa7caa.pdf
    • https://static.usrfiles.com/ugd/fd30ac_a488316bd46c4270be7fe7c3c0397df2.pdf
    • https://static.usrfiles.com/ugd/fac845_89dcf8d5e8e04c0ba4b3f46dd734372c.pdf
    • https://static.usrfiles.com/ugd/5ecadc_839676dcb2404680a1992df316afe887.pdf
    • https://static.usrfiles.com/ugd/b8c837_9861b9e5a22748e091115c8e140b1ca8.pdf
    • https://static.usrfiles.com/ugd/ef253e_45575583834346fe8b0803bf5f0f15e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2a34d609c6451b88034df86830965c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7dc2931988214758ae7ed0004285d4b9.pdf
    • https://static.usrfiles.com/ugd/74a852_65b51e406bc04040961b9537c7df3701.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ff0917d947c45d19f3b22cda3ddc578.pdf
    • https://static.usrfiles.com/ugd/d5cf39_dccb1b04c3a34070996a19c159c15a4b.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_off00006015.bin
14f01063446c76c68383bad53909eade9cc5d54b024d324783dd51492a2ee0e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 5160 bytes
font_01_sfnt_off000071a0.bin
daaf33b04caca0100fb35631a8a2c3d87f07ba31792a1bb322deb72d5b8733f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A0 10380 bytes