Malicious PDF — malware analysis report

Static analysis result for SHA-256 94eaed6f759d45ea…

MALICIOUS

PDF

65.0 KB Created: 2020-07-16 23:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14341648844f651323f9fc87a00744af SHA-1: a6e3859282af630d562e56456ecbe95e9148a9b4 SHA-256: 94eaed6f759d45ea7af4b6dcc752ddfba80ebbec97c397104c68d230d5f04b49
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 pointing to various PDF files hosted on external domains, constituting a link farm. One of the primary links redirects to a known malicious infrastructure at ttraff.ru. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

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=subaru%20impreza%202017%20manual
    • http://files.vermontadventuretours.com/uploads/1/3/0/7/130774965/jifes.pdf
    • http://files.iorinishioka.com/uploads/1/3/2/3/132303239/4539972.pdf
    • http://files.giaddiecreations.com/uploads/1/3/2/6/132695701/tajipibu.pdf
    • http://files.cleaninvention.com/uploads/1/3/1/3/131379639/8520770.pdf
    • http://files.laurenswildliferescue.org/uploads/1/3/1/4/131452872/8957288.pdf
    • http://files.toniandgarry.com/uploads/1/3/1/3/131382531/jagevaw-fukorozipuw.pdf
    • http://files.dunphyshandguntraining.com/uploads/1/3/2/6/132681566/d354c601d.pdf
    • http://files.doulaplus.com/uploads/1/3/1/1/131164275/1655283.pdf
    • http://files.berkeleyltc.com/uploads/1/3/1/1/131164132/f4342eafd891.pdf
    • https://semigumita.files.wordpress.com/2020/06/gozopuloda.pdf
    • https://lokewigokun.files.wordpress.com/2020/07/9455560472.pdf
    • https://batamoxekopu.files.wordpress.com/2020/07/38778693033.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/bavijedifufilepuvom.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/titulozirabuzizobeviw.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/mowowemalapekedupar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0487/files/gakejeju.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/95099746393.pdf
    • https://cdn.shopify.com/s/files/1/0428/3174/1095/files/bosigeboderotusufixije.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/23376592324.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c204.bin
3e79d83b1cfc824fa09faf31b3830d6e0ffd1497488dd9acd833fd65d1258f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 5180 bytes
font_01_sfnt_off0000d384.bin
2aa518022a6e4cea1304fa86c24b6c8a4bf002e835f064944838998c9df75647		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 10344 bytes

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