Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4a2fd7edc00d7b…

MALICIOUS

PDF

42.5 KB Created: 2020-08-25 11:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21925cd08bb92f5770a7644bb051ecea SHA-1: b55cd2a5a547414d068a42339e51dc1db6333b71 SHA-256: cb4a2fd7edc00d7bf05f7905769240c4c30f1eef7b542bed2650a0a2d2c5d187
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector at 'https://ttraff.ru/pify?keyword=ifrs+9+off+balance+sheet+items'. The document body, though partially corrupted, also contains this URL and references financial topics, suggesting a phishing lure. The presence of numerous external PDF links, many hosted on Shopify, further supports the link farm heuristic. No scripts were extracted, but the primary attack vector appears to be the malicious redirection.

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=ifrs+9+off+balance+sheet+items
    • http://miluf.photosfrommyheart.net/uploads/1/3/0/9/130969746/4312653.pdf
    • http://files.oceanheartscollide.com/uploads/1/3/1/4/131437552/xarogezegefadevexota.pdf
    • http://files.d-ark.info/uploads/1/3/0/7/130740056/4899523.pdf
    • https://cdn.shopify.com/s/files/1/0439/7488/5534/files/lidumuwemaxejazikujoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/swot_matrix_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9052/files/faposu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7104/4770/files/99808276010.pdf
    • https://cdn.shopify.com/s/files/1/0464/1187/4472/files/what_is_the_full_form_of_misfortune.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/aqua_barbie_remix_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/58205000482.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_off000068c6.bin
95748260d2f40aa98e5754d1001ae8e468701ac99e21599350ea6e9bf44cdd2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C6 5356 bytes
font_01_sfnt_off00007ac0.bin
a2a01750f9369fac270aff4c781706e834cdb658b7b0df88235d9634f1948f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC0 10288 bytes

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