Malicious PDF — malware analysis report

Static analysis result for SHA-256 f273ab26bb9bb4e0…

MALICIOUS

PDF

43.5 KB Created: 2020-08-07 14:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3105a702852e32fb66ad0c6038cfd9f SHA-1: a43e032cacf3d8d105fbc695ffd32e4e6972a9d1 SHA-256: f273ab26bb9bb4e09916680f4beaf699faddac5d3875f987ac651355c9372749
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=astell+kern+ak100+manual+pdf', suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates an attempt to manipulate search engine results or distribute malicious content.

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.cc/pify?keyword=astell+kern+ak100+manual+pdf
    • http://files.drjamesworling.com/uploads/1/3/2/3/132303068/xuzopusimijaniwe.pdf
    • http://files.wlovedesign.com/uploads/1/3/0/8/130814605/b73f96c5605a9e.pdf
    • http://files.mountainlakewinery.com/uploads/1/3/0/7/130740174/xosog_wakapit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4231/files/software_quality_assurance_training.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0426/files/93536317491.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/gilagobuzidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6629/3401/files/26410478948.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/anaemia_types.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/retorika_aristoteles.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/29794362151.pdf
    • https://cdn.shopify.com/s/files/1/0438/2110/5309/files/rosobulebabiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/various_definitions_of_history.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/english_grammar_word_search.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/67408798075.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/38844961512.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1219/files/the_java_programming_language_5th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/64968696771.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_off00006b82.bin
223cb7a353ec82dd605ada7b0ad685aa046f5ba0dcd8e1f9133eeeacdc487f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B82 5432 bytes
font_01_sfnt_off00007def.bin
89d668f9d5cd4327543e7b47b7bc6b194259c34bafe434bf0b18df6ef3994999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEF 10328 bytes

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