Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f64cf1533c7c914…

MALICIOUS

PDF

37.5 KB Created: 2020-07-28 09:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2a408cf050633e015ab4640449c8d23 SHA-1: d4bbaf372f4f3a22682c490071333ffe532a3f49 SHA-256: 6f64cf1533c7c9145f3767eb0e679a06031d3faa2e190b8132eae9b6508c5186
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=easeus+partition+master+free+user+guide`. It also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on Shopify. The presence of a 'download button' lure further supports a phishing or scam attempt. No scripts were extracted, but the overall pattern suggests a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=easeus+partition+master+free+user+guide
    • http://files.wehaul2play.com/uploads/1/3/1/1/131164568/baa7b.pdf
    • http://files.bereangracechurch.com/uploads/1/3/2/6/132695574/2941481.pdf
    • http://files.cominghomeadventures.com/uploads/1/3/1/8/131856917/1321306.pdf
    • http://files.whistlingfrogresort.com/uploads/1/3/2/6/132681002/masaberilanimubaloji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/33011772567.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9802/files/rupiku.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6406/files/pufulufixodonipatobifoxud.pdf
    • https://cdn.shopify.com/s/files/1/0431/7030/0061/files/19087810720.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9585/files/53414946179.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/15528761141.pdf
    • https://cdn.shopify.com/s/files/1/0432/4219/3058/files/kimodinabasewoko.pdf
    • https://cdn.shopify.com/s/files/1/0440/3917/6342/files/pesagepugike.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/92690713727.pdf
    • https://cdn.shopify.com/s/files/1/0435/7213/4049/files/rugip.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1871/files/pukorenobuxozad.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/82014590285.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_off000057b5.bin
b226b304b49dbcb6ceb709bf95a8daa4273017d1ce4810e21cafdfa9ca15ebd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B5 5168 bytes
font_01_sfnt_off00006933.bin
956a25825c90fdec3bbd483ab886fb627d86209e8b14e6bd82d38f9a623282f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6933 9216 bytes

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