Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f76521461bb1ca2…

MALICIOUS

PDF

58.4 KB Created: 2020-08-20 01:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a8994a70199300bb20afdcd4522b2ef SHA-1: bc1fbffcc265918bc504af74e66080873fd43eef SHA-256: 0f76521461bb1ca2e6a86bdffc304595aac01d2efe78d0e77c4445ad36c2e485
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

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=mobile+automation+testing+tutorial+pdf
    • http://files.trulyyoulifecoaching.com/uploads/1/3/2/3/132303229/1fd062097f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7009/5521/files/4178958668.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/social_facilitation_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/bovolipebexoju.pdf
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/wotijuzezutoxap.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6026/files/mubusop.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/wagos.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/4473935162.pdf
    • https://cdn.shopify.com/s/files/1/0431/7052/9436/files/joronedimi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/68755008986.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_off0000a169.bin
b24456b1a6ecd1fa023f21703e26795aa457be5376178952a604f660ad202a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA169 5508 bytes
font_01_sfnt_off0000b405.bin
72964b36c7bb656df2ddabfd229759518e69d7c077f9e26ae957621175e27301		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB405 12732 bytes

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