Malicious PDF — malware analysis report

Static analysis result for SHA-256 e251d55ae83a841b…

MALICIOUS

PDF

46.1 KB Created: 2020-08-04 15:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e597a47dc1afe8060b987f364e2e94e4 SHA-1: fc2a8a60515f57298e296c99eed094db580f513a SHA-256: e251d55ae83a841b819e6d03b9a6b24fe274fee8cbc78f791bc37c6f11077586
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, pointing to 'https://ttraff.ru/pify?keyword=formula+for+price+elasticity+of+demand+pdf'. This indicates the document is designed to redirect users to potentially harmful content. The PDF also features a link farm, as detected by PDF_SEO_LINK_FARM, further suggesting a distribution or phishing attempt. The ML classifier strongly supports the malicious nature of this PDF.

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=formula+for+price+elasticity+of+demand+pdf
    • http://files.buyhighlandhideaways.com/uploads/1/3/1/3/131380733/nadikusinilavuwiji.pdf
    • http://files.eriwonders.com/uploads/1/3/0/7/130739571/7221100.pdf
    • http://files.ponderingcat.com/uploads/1/3/1/6/131606260/rozerapifudozozoguj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/17069435632.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/zobakukojaxapova.pdf
    • https://cdn.shopify.com/s/files/1/0433/5874/8837/files/86399349301.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7202/files/tosafapowuzinaxidugo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5106/3195/files/e6_a2_85_e8_8a_b1.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/72954162852.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6071/files/28047990731.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/meposituxevibopuromir.pdf
    • https://cdn.shopify.com/s/files/1/0431/1056/4002/files/titejuzipijomevigef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30347825404.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/bazuzewi.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_off0000755e.bin
a0406030255b18affc95538ea5ba9c3072cea0df7b9f3d4a573179fceefa620e
pdf-font-stream PDF embedded font (sfnt) at offset 0x755E 5360 bytes
font_01_sfnt_off0000878c.bin
7655af4283214e61c0e1e16509e7467e518f7f48cb38312ced8fde8bc4be3a7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x878C 10576 bytes