Malicious PDF — malware analysis report

Static analysis result for SHA-256 74518abe56eef36f…

MALICIOUS

PDF

38.0 KB Created: 2020-08-29 21:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c0866cbf9f51ad3a7d1ea03944871b5 SHA-1: a5bc7f517ceace2c4397de9bf64ec69c81f51caa SHA-256: 74518abe56eef36f6b8569eefaa078a2b4fd1015c006ec9e5ecd46bf64b9effb
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a critical finding, pointing to 'https://ttraff.ru/wix?keyword=corvo%2527s+folding+blade' as the malicious destination. The presence of numerous other links suggests a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the embedded links are sufficient evidence of 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/wix?keyword=corvo%2527s+folding+blade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/21920803143.pdf
    • https://cdn.shopify.com/s/files/1/0437/1965/5579/files/irs_enrolled_agent_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/48748914086.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/ririwesuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/93382197490.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/18489949753.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/fafepexa.pdf
    • https://cdn.shopify.com/s/files/1/0454/5989/8518/files/british_sign_language_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7779/files/python_circular_import.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/25114362950.pdf
    • https://static.usrfiles.com/ugd/34ec99_15ce7d09996844e3bf83bcccee9e9b60.pdf
    • https://static.usrfiles.com/ugd/b8c837_bde90f7483ef46718d6fc682b1c3613f.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/origami_aviones_de_papel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/archer_season_10_episode_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/26367431717.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_off00005714.bin
34cc2d006fc54ca763fb00dce08f1aa28842f554d46e9a3dbb5d3ccd3e1db578
pdf-font-stream PDF embedded font (sfnt) at offset 0x5714 5212 bytes
font_01_sfnt_off000068ed.bin
02c6cd3d4fbc45d4916dd5470c4fe6bff528129b12bb45422958bbe65a808d50
pdf-font-stream PDF embedded font (sfnt) at offset 0x68ED 10092 bytes