Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9b99bc88cc99f1…

MALICIOUS

PDF

41.5 KB Created: 2020-08-02 09:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6ec72867cc889efd70b22cd0430de69 SHA-1: 57fc84b756b411ec650c32b94bd2eb59233dcf01 SHA-256: fa9b99bc88cc99f1d544939e4a3bdc67da6777e0fa91245334d73a3cfdf8d08d
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also features a large number of external PDF links, suggesting a link farm or hosting for malicious content. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=utorrent+cannot+find+path'. No scripts were extracted, but the document body contains garbled text and URLs, reinforcing the malicious nature.

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=utorrent+cannot+find+path
    • http://files.holosterra.com/uploads/1/3/1/4/131453919/xepipozemupod-xakanifakipuj-pilesiviposupur.pdf
    • http://files.martinsvillesoapworks.com/uploads/1/3/2/6/132682076/5226262.pdf
    • http://files.evolutionmeetings.org/uploads/1/3/0/8/130874668/7204084.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/jigiwetosebin.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/boxiredigogusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/89134247133.pdf
    • https://cdn.shopify.com/s/files/1/0434/6819/3952/files/72470008748.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/walker_physics_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/audels_carpenters_and_builders_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2661/files/judimobabiwaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/nepududopovusaner.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/nuritiwadagovujifolan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0433/6769/4501/files/26906757199.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_off0000658e.bin
641fd19f7789da98d526bef5b760286765fa87c23cc7eb10e488a2afa39ea309
pdf-font-stream PDF embedded font (sfnt) at offset 0x658E 5024 bytes
font_01_sfnt_off000076a7.bin
b390679b4c3ed5d39c830375fe54e398fedc742432085b82a650c5f34bc5ff75
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A7 10180 bytes