Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91696a89aef1df0…

MALICIOUS

PDF

42.4 KB Created: 2020-08-18 17:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e3caf08ae1bfd6b562e86add956f039 SHA-1: ba7154ef9b6b0a67a8006a0a6c01eb8848ee6436 SHA-256: c91696a89aef1df0eb60533b2bde9537f558db04d121e45289457b8eac5f0193
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=caaspp+practice+test+answers'. Another critical heuristic identified a PDF link farm, with many links pointing to Shopify domains, but the primary redirector is the most concerning IOC. The document body contains garbled text but includes the same redirector URL and several Shopify links, suggesting a lure to disguise 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=caaspp+practice+test+answers
    • http://doxisapo.abamericanhistory.com/uploads/1/3/1/3/131378960/rekavemu_wilox.pdf
    • http://jumuzi.banginhardfireworks.com/uploads/1/3/1/6/131606490/0a54b6ad793d372.pdf
    • http://files.monicazinn.com/uploads/1/3/2/7/132712251/diveluterilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9167/3763/files/tazibupadaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/deved.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6165/files/temumup.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2755/files/939903397.pdf
    • https://cdn.shopify.com/s/files/1/0434/5423/4785/files/31386164913.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/biology_upsc_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/blogspot_books.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/cbse_computer_syllabus_for_class_6.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/kitovewimefi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/skripsi_akuntansi_internasional.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/kulozomolomovuduvikanefeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/13069109972.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/vezuronasowijidorodape.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/nugaziguj.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_off000069d7.bin
48fe5e1e68406154e2096c3d6ace7884dbdf896da3954ebe1ebd8399bdf583ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D7 4892 bytes
font_01_sfnt_off00007a9a.bin
f67c2b63fdfd1e4eb6f86a557ac5e86048e449ab461f16453ad56e7348328558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9A 10012 bytes

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