Malicious PDF — malware analysis report

Static analysis result for SHA-256 1878a7b5d421ede0…

MALICIOUS

PDF

47.1 KB Created: 2020-08-07 02:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e16b3912b4eacc42625bedd5ab58c7a SHA-1: 28307194d2abfc39877689b8a9dffdfa0d11e129 SHA-256: 1878a7b5d421ede0a4c9d0617cfe45b892892917c79f0bbddc62a538a81c49aa
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=centrifugal+pump+theory+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious content. The presence of a large number of external PDF links further indicates a link farm or SEO manipulation tactic, likely to obscure the malicious intent.

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=centrifugal+pump+theory+pdf
    • http://files.peakhealthcaremaryland.com/uploads/1/3/1/4/131406816/rizapisopasiraluzoga.pdf
    • http://files.lehighvalleychorus.com/uploads/1/3/1/3/131379525/eb43d1f92acae.pdf
    • http://files.fixfonezfast.com/uploads/1/3/2/6/132696029/1cad3b61ca381.pdf
    • http://rogaraw.owlridgetaxidermy.com/uploads/1/3/0/7/130776433/veraki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/gojojelepigumirevuromo.pdf
    • https://cdn.shopify.com/s/files/1/0444/8436/2407/files/english_conversation_in_interview.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7529/files/9997444149.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/tusuvapiralejulazogovawa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/75789830006.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/gusajijekaxevokuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/40276258879.pdf
    • https://cdn.shopify.com/s/files/1/0432/8292/3676/files/92180772243.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6405/files/dijkstra_algorithm_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3656/files/roots_and_affixes_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1878/files/tijiveloxunopedupaguwut.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/kujutobijipopek.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_off000079c8.bin
17e66ef5ae466d82a46911d030e531917d78d9698a8f8413285b65dd764c7bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 5284 bytes
font_01_sfnt_off00008b9c.bin
9c6633e011098079bf6d17b787246dfc7c846a2371d110d4d934733b1f9040ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9C 10632 bytes

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