Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fae5d2aca60e862…

MALICIOUS

PDF

42.2 KB Created: 2020-08-06 05:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e34c545dee54da30a86f526cc1f47bb5 SHA-1: fcbb31e361b661a3e388d73c2fdd0da552fd4f25 SHA-256: 2fae5d2aca60e862a410fa3d94ed60d1229f71935122eca2172397696dfbbff4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=useful+russian+phrases+pdf`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on `cdn.shopify.com`. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure to disguise malicious redirection. No scripts were extracted, but the presence of a malicious redirector and link farm strongly indicates a phishing or redirection attempt.

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=useful+russian+phrases+pdf
    • http://bejuxeker.tampabaychiefs.org/uploads/1/3/1/4/131437423/da9d75f9b21a06.pdf
    • http://fevegid.aimeemsands.com/uploads/1/3/0/7/130776445/pasasim.pdf
    • http://files.gwionraven.com/uploads/1/3/1/0/131070535/bekufud.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6406/files/lixowavifiro.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/44347649176.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/73921069652.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/mawuginovabimitawomefo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1107/files/87322243161.pdf
    • https://cdn.shopify.com/s/files/1/0429/4872/2851/files/44647948007.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4166/files/anexar_no_sei.pdf
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/zolitewovovinilafaxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/gomukobekogivi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/47913440981.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/xedofi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b30.bin
e3fcb83835947f277235226dcb445896fb6ef96bb3f677229ad5aba8ae74dfda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B30 4812 bytes
font_01_sfnt_off00006b65.bin
7194be987600e7c97cbc84f08425ada0923941bf76cf8f439a4575374e274cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B65 10080 bytes
font_02_sfnt_off00008de7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE7 4324 bytes

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