Malicious PDF — malware analysis report

Static analysis result for SHA-256 0881a48c475b8d20…

MALICIOUS

PDF

47.7 KB Created: 2020-07-13 16:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23e74f338d84a34a61ee8bef6c131246 SHA-1: c7f069bba7c2304286a08a63796e02555d4f1664 SHA-256: 0881a48c475b8d20725f62a79f17d6cc283853d51292e75002215b413f7fa7eb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, appears to be a lure related to a book title, suggesting a phishing or social engineering attempt. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator 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/wb?keyword=alain%20de%20botton%20consolations%20of%20philosophy%20pdf
    • http://files.hopewellcompanies.com/uploads/1/3/1/0/131070485/be771c4b7f395b1.pdf
    • http://files.omygoddess.com/uploads/1/3/1/6/131636862/19096a962e8.pdf
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/61867032839.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/mapezusedisusiro.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/pobufosegavekinevivobowus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/91060691094.pdf
    • https://dibababisiva762007800.files.wordpress.com/2020/06/90073144530.pdf
    • https://rawosevatati.files.wordpress.com/2020/06/27044322975.pdf
    • https://sovujegazof.files.wordpress.com/2020/06/zagasatevixerara.pdf
    • https://ranosadimo.files.wordpress.com/2020/07/widubuliv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/83461878762.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/23765914192.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/6492730329.pdf
    • https://cdn.shopify.com/s/files/1/0432/8400/5032/files/vobolurelesadanirurex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/30397729892.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xedatojif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9459/files/kikunexufanelej.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_off00007cf7.bin
01fb5cb464d340fec16bd926cb44b3e60b3d4c2758bfacccb4d04753016f3a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF7 5168 bytes
font_01_sfnt_off00008e83.bin
6ffbd7edd25348e4935ffa7e724fa6a68e906cba7ff4170cb2ddb473e82160f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E83 10052 bytes

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