Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac095e96c2abf949…

MALICIOUS

PDF

44.0 KB Created: 2020-08-02 22:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3a1fd02b5f9513f557f3bf1de417e7d SHA-1: f035ff0b2e13bd8a2e1fd1354e88edd39cf71fbf SHA-256: ac095e96c2abf949cc86451f7074f1d77b1df23f2ea07af9c46f5ef875a365e5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the phrase 'Oedipus rex study guide pdf' and the malicious URL, indicating a lure to disguise the malicious intent. No scripts were extracted from this sample.

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=oedipus+rex+study+guide+pdf
    • http://files.aboutmom.nl/uploads/1/3/1/8/131871814/gamema.pdf
    • http://files.leetrull.com/uploads/1/3/1/4/131438157/370ed2e904e807.pdf
    • http://files.sarahelizabethpowell.com/uploads/1/3/2/3/132302923/f3eb0fc4f.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/mokupukurozitapiwen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4227/files/zadik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/94510482411.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4750/files/jokusuvetafob.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/80030763651.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/lazituzewivoxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/93538824597.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/63023188954.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0939/files/lokebagusalavuvidug.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/36688984310.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/ropiwitakomawedela.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.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_off00006255.bin
e3d7ced056cc755cf231ced0d1eb939f893f899ce64ac939e2d0a150bdc3b22b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6255 4828 bytes
font_01_sfnt_off000072ed.bin
5f55242c7a9f41417391c57b40c4c993c70396f2c6ac5997d88814e2c24c3b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72ED 10096 bytes
font_02_sfnt_off00009545.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9545 4324 bytes

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