Malicious PDF — malware analysis report

Static analysis result for SHA-256 d378de9943aed7e5…

MALICIOUS

PDF

41.7 KB Created: 2020-08-26 02:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5fa0df9a0d355176fe43cab74bb2175 SHA-1: 2dfb88bc3f75dc382291d7dce2ebd92db13adf04 SHA-256: d378de9943aed7e54831df16c4f7fb310a266c14e2a673f5d127f93d73f335e4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document body itself is obfuscated but contains the URL and text suggesting it is a game guide, likely a lure. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=dragon+age+inquisition+collector%252527s+edition+prima+official+game+guide+pdf
    • http://fonaj.jessicaslaymakerart.com/uploads/1/3/0/8/130874276/poxotojijutadilawim.pdf
    • http://wolubi.westsideestates.com/uploads/1/3/1/4/131453870/tatubumaziminefirana.pdf
    • http://faziwi.clearlakestatepark.org/uploads/1/3/0/7/130738732/18193b5115aeb3.pdf
    • http://files.spsyc.online/uploads/1/3/1/4/131483108/9279828.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0971/files/15134572987.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3188/files/68445351039.pdf
    • https://cdn.shopify.com/s/files/1/0436/4566/5433/files/tozononovevizadum.pdf
    • https://cdn.shopify.com/s/files/1/0429/5871/7087/files/biology_class_11_notes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/wujujebivemaditimegevobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/61440292153.pdf
    • https://cdn.shopify.com/s/files/1/0432/0906/4607/files/achilles_tendon_repair_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/nivuwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7257/6922/files/venamub.pdf
    • https://cdn.shopify.com/s/files/1/0433/4728/0026/files/63091281475.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_off0000623b.bin
ebf0798aaa7af405b5689c4442f2734c685a2eb9c7114d356288e19ccd75bb30
pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 5636 bytes
font_01_sfnt_off0000754c.bin
8e3cb3f20171adf2a8da6bbab8ad527207245cae13e083362c2ebb92e02db854
pdf-font-stream PDF embedded font (sfnt) at offset 0x754C 10476 bytes