Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f016c8145bf13ad…

MALICIOUS

PDF

39.7 KB Created: 2020-08-02 10:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f8bc0a4c6d2436699f87506a1f2a5eb SHA-1: 6ee96022e970bd4f8508fb899e7bb5587b7d5539 SHA-256: 1f016c8145bf13ad8594208de5dde7d57c59d4981adf42e39cf61aed7e636b5e
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 for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=reloading+manual+pdf'. The document body text, though heavily obfuscated, contains this same URL, indicating the primary intent is to lure users to click on malicious links.

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=reloading+manual+pdf
    • http://files.burlinistudio.com/uploads/1/3/0/7/130775448/jedumilapofo.pdf
    • http://files.allmytreasures37.com/uploads/1/3/0/8/130814492/sufinafunewupe-gapololej-fibipagovu.pdf
    • http://files.xintongwang.site/uploads/1/3/1/6/131636719/bixiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/gakika.pdf
    • https://cdn.shopify.com/s/files/1/0436/0021/6232/files/devomujatejixawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1928/files/jivosopagez.pdf
    • https://cdn.shopify.com/s/files/1/0436/8387/2921/files/xezidemuwetikorapajo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/bategegitufagip.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/soxapatanikef.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/wogonefenazejukirab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/66358279692.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4885/files/66081493216.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/51252972270.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/55886458094.pdf
    • https://cdn.shopify.com/s/files/1/0433/2886/4409/files/16406145507.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_off00005ecd.bin
284c2951d5edd4ad4234fdc750aafe19761cb26b83c7418da37ecc2b2f80318c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECD 5092 bytes
font_01_sfnt_off0000701e.bin
481469cd54f4dfadf69476abdfa6c7122b8cd1832948af672f26898c6a9429db
pdf-font-stream PDF embedded font (sfnt) at offset 0x701E 10032 bytes