Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a973fbc9ed7c2f9…

MALICIOUS

PDF

52.2 KB Created: 2020-08-04 05:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba59593bae083fcface4bf3417ee0a2c SHA-1: b0ec6f56ddca841bb43177e44b5d11af5fc42645 SHA-256: 5a973fbc9ed7c2f95dca9be63b53f88d0e12faaf863a2b14d3440e21ef6b7e49
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings for malicious redirectors and link farms indicate an attempt to direct users to harmful content, likely for credential harvesting 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.com/pify?keyword=fundamental+of+accounting+principles+pdf
    • http://files.cliochris.com/uploads/1/3/1/8/131857626/549328e961.pdf
    • http://files.marquetterecreationaltours.com/uploads/1/3/1/1/131164387/6972053.pdf
    • http://files.va-homeinspections.com/uploads/1/3/0/7/130739779/wakelibap_guzojulupanow_papimoki.pdf
    • http://files.rhemayoga.com/uploads/1/3/0/8/130814676/vigimirobilupefeboz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/zupisotokupugalesazuwal.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1395/files/bosasofisufaxukajesipif.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/54278099328.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/topafixogapelavufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/6384695012.pdf
    • https://cdn.shopify.com/s/files/1/0434/2510/4028/files/analytical_and_logical_reasoning_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/disav.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/vovagibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54748680829.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4005/files/78475564054.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/siwopurirot.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/sojox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42820491308.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_off00008e32.bin
30b3714665e78c7b17f7487feba999a336562c2c113d4cd4172dfee6b80cd6bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E32 5432 bytes
font_01_sfnt_off0000a099.bin
a5906f9a6e98fe1389dc1c907ea9032f897a8d1f8bb680c1f4954a627cea275a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA099 10392 bytes

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