Malicious PDF — malware analysis report

Static analysis result for SHA-256 619df926af5fc67e…

MALICIOUS

PDF

37.6 KB Created: 2020-08-14 22:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0f520d9723b4a6712e36605cf10b40a SHA-1: 3d2fd81f1fffb0fc4452a34115250861cf1339f1 SHA-256: 619df926af5fc67e7977088fc0deece980f83a5f93d13dfa87a6eaff4742c899
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains the malicious redirector URL.

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=lesser+arcanum+of+voracity+guide
    • http://funeduv.newlifeglobalministries.org/uploads/1/3/2/8/132814930/tuvufoweda.pdf
    • http://foxevope.wisefishworld.com/uploads/1/3/1/3/131379730/87e2e99da469993.pdf
    • http://witalasul.edyspsds.com/uploads/1/3/1/6/131636725/dodimebefufonuk.pdf
    • http://files.yogawithieva.com/uploads/1/3/2/7/132712209/foreno_lizeruxufesaxe.pdf
    • http://revijoni.wickycandlesllc.com/uploads/1/3/0/7/130739616/a5980a82089.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6092/8405/files/zuxepolebupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3514/0007/files/2891273991.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41230052817.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8116/files/mandat_cerfa_13757.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4826/files/62885971883.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/morfologi_aspergillus_niger.pdf
    • https://cdn.shopify.com/s/files/1/0428/4104/7206/files/47569509653.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/d3._tip_is_not_a_function.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/5x5_risk_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/nikes_on_my_feet_lyrics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046d3.bin
7965e0e417cd324b8ae2b7e12e4fd76689375c79d538d7af4da948668468b391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46D3 5292 bytes
font_01_sfnt_off000058c4.bin
73c55ac6c136ac6064ee56990abbd1a1fdd9296891064e5d45842766a33c8fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C4 10140 bytes
font_02_sfnt_off00007b6d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6D 4324 bytes

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