Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2b5b035aed22de…

MALICIOUS

PDF

36.0 KB Created: 2020-08-14 02:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6701321a593e075a6ef382ed91fa7ca SHA-1: b9847c1ce73ee8555cb94220f3f2f55f47cf693a SHA-256: 6f2b5b035aed22deba8e50fef90bf6e1f601fcb2887e8ece6200ba3077321bc3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm or redirector service, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links, particularly the one to 'ttraff.ru', suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=cuddledown+sloth+sheets
    • http://files.152811427883146431.com/uploads/1/3/0/8/130814926/ecf835.pdf
    • http://dawuno.richardmerrill.net/uploads/1/3/1/4/131453540/nuseguru-jixufuwaler-nurebis.pdf
    • http://files.liveinlovecs.com/uploads/1/3/0/7/130775462/zomeberax_lomidi_falunukoposinoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/ripifapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1532/files/lalinusofo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9098/3574/files/ethiopian_orthodox_bible_names_in_amharic.pdf
    • https://cdn.shopify.com/s/files/1/0435/9657/8975/files/simple_past_exercises_esl.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/different_types_of_bolts.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/wesufuwuxaluxawem.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/btec_business_level_3_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0440/0729/3086/files/zekivudowifako.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8951/files/texas_commercial_driver_license_manual.pdf
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/anemia_peru_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/7610/5893/files/fajomanijomatobupegimak.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/new_technology_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/roxazavanizokepaze.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_off000050cd.bin
60a6c319bee2a392c87a3e38c6899217c3d86c89b54570308e5296a4ea5ae965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50CD 4604 bytes
font_01_sfnt_off0000607f.bin
e91a3c8f5019a17989db931074900aa80c31541c199bc5dd3ef0831674f7b1e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607F 10148 bytes

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