Malicious PDF — malware analysis report

Static analysis result for SHA-256 0576c18c103ba91b…

MALICIOUS

PDF

37.7 KB Created: 2020-08-07 05:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6669ab95c6cfdf5786c751339167a05 SHA-1: eedcbd1014e221f8bfd078cec0c5d2908d5c9e07 SHA-256: 0576c18c103ba91bcbe0998bed01f4f42e85d0521df03b78ec46b6a3d6e1621d
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a school exam. The presence of numerous benign-looking Shopify links suggests an attempt to blend in with legitimate content while directing users to malicious 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=ameryka+p%25C3%25B3%25C5%2582nocna+i+po%25C5%2582udniowa+sprawdzian+pdf+klasa+8
    • http://xasavud.kaleighbettyphotography.com/uploads/1/3/1/3/131380600/zatanalivokun_jukirile.pdf
    • http://files.cleanteamprestwich.org/uploads/1/3/2/7/132710628/6475422.pdf
    • http://files.appletreecontractors.com/uploads/1/3/1/6/131607712/9709263.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4375/0039/files/ca_intermediate_books.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/support_vector_machine_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3253/files/founder_badge_twitch.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/23162772706.pdf
    • https://cdn.shopify.com/s/files/1/0429/4321/7830/files/ccna_security_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/2239525400.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/58972310601.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/37199318465.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/knowing_god_ji_packer.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4675/files/prcomp_r_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/jajofutelomupofelifo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1710/8642/files/turkish_phonology_morphology_and_syntax.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_off00005070.bin
579c505ca18a6dca95438213ecc62d9b633e474f9035a9c2ade163d252cd54ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5070 5984 bytes
font_01_sfnt_off000064ac.bin
8703393eabacce0a1478862761afdb43852424faf893ea42f831a8f834333951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AC 10956 bytes

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