Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e80f00bbca2703e…

MALICIOUS

PDF

56.7 KB Created: 2020-08-10 01:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ab779eb8461c9ec2795b9b0a607aadc SHA-1: 01b715d0824d93e0ecad0451918d513ece6e0f80 SHA-256: 3e80f00bbca2703e11a050a1443fb4fe837ab0bf96ae460723257fc4df57791e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=compliance+audit+pdf'. The document body, though heavily obfuscated, contains this URL and other Shopify-hosted PDF links, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to malicious infrastructure.

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=compliance+audit+pdf
    • http://files.dahliaburroughs.com/uploads/1/3/1/4/131437683/pulizobemukefiw.pdf
    • http://files.cofhhe.org/uploads/1/3/1/0/131071037/vibesuni.pdf
    • http://files.impactarcheryclovis.com/uploads/1/3/1/4/131483266/9934640.pdf
    • http://files.placentatrainingcompany.com/uploads/1/3/2/6/132696015/jubumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/3221587774.pdf
    • https://cdn.shopify.com/s/files/1/0429/3686/0839/files/devededatisarexosus.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/fesenivorire.pdf
    • https://cdn.shopify.com/s/files/1/0434/8719/9394/files/discuss_the_stages_of_curriculum_development.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/visodi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/ace_academy_notes_for_gate_mechanical_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0946/files/wadaragawopokimulijojad.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/begenufafezeweb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/wezugadujunumagow.pdf
    • https://cdn.shopify.com/s/files/1/0439/4732/7646/files/bashan_250_service_manual.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_off0000a28f.bin
9d3f41030b6fd8af8e42b12acb1782d757c1ceec16fb771c4d83c5a61beb621c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA28F 4932 bytes
font_01_sfnt_off0000b345.bin
ad9f6ba78e182ed5603dc59896f256160a8fda507f07f7ecd024681ec3aa137a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 10256 bytes

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