Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf73293c275f1cad…

MALICIOUS

PDF

41.4 KB Created: 2020-08-24 05:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeb9338572d82a84b43fbaf2be98e35d SHA-1: 04baddbd0e05ebf472546fc760ee3f6ddca2effd SHA-256: bf73293c275f1cadcc36deec5b3d7b405e4c47a686e32266b610052307df5804
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, contains text related to academic dates and the authoring application, suggesting a lure to disguise the malicious links. The presence of a link farm heuristic further supports the malicious intent of directing users to external, potentially harmful, sites.

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=mdu+date+sheet+reappear+6th+sem+2019
    • http://gaduwoz.hillsideauto.org/uploads/1/3/1/4/131411150/3e12a733e3801.pdf
    • http://files.shannonedwardsphotography.com/uploads/1/3/1/8/131858044/leditoto.pdf
    • http://pogediw.tamara-vasquez.com/uploads/1/3/0/7/130776089/3befbb40ebea59.pdf
    • http://files.lusakaliving.com/uploads/1/3/0/8/130815014/zageki.pdf
    • https://cdn.shopify.com/s/files/1/0429/9007/6057/files/38724342689.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2269/files/37834509385.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/91773516210.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/68723288978.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/gigowenixikazepegidisug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0700/8168/files/ada_compliance_checker.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/8871413193.pdf
    • https://cdn.shopify.com/s/files/1/0433/4426/5366/files/calculus_early_transcendentals_11th_edition_anton.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_off00006008.bin
0709a7a93688398b73fbea1adef282ff02eea4371cbe959a9a8c6a3b9856dc53
pdf-font-stream PDF embedded font (sfnt) at offset 0x6008 5808 bytes
font_01_sfnt_off000073ad.bin
cb2f6eba54b9c0c75df6971ae47c49629d5d2558c2ffeead5eb70d7c24184cda
pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 11328 bytes