Malicious PDF — malware analysis report

Static analysis result for SHA-256 2624eb4d42a5cebc…

MALICIOUS

PDF

52.7 KB Created: 2020-08-01 20:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 221476b60cacc89b759582489e684528 SHA-1: ac75ba069d8c9e1188bc6f40036051c82eea53a2 SHA-256: 2624eb4d42a5cebc6cee3beeda65bac81e02d8b64117d27088aae6a88073f3df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded external links, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of these links, https://ttraff.com/pify?keyword=producer+consumer+c%252B%252B, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but the presence of the malicious redirector URL and the link farm strongly suggests a phishing or malware distribution attempt.

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.com/pify?keyword=producer+consumer+c%252B%252B
    • http://files.palutabulations.com/uploads/1/3/1/1/131164321/56e586cddb2956.pdf
    • http://files.qtsc.biz/uploads/1/3/0/9/130969431/368ede258e20d34.pdf
    • http://files.ncpastoralcounseling.org/uploads/1/3/0/7/130738870/7999181.pdf
    • http://files.missgoob.com/uploads/1/3/0/9/130969565/pubumi.pdf
    • http://files.missgoob
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/likizokago.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/29551261911.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikumakosesik.pdf
    • https://cdn.shopify.com/s/files/1/0430/7497/7945/files/18898013343.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7268/files/tunemetulejilabikigubosi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/89373633592.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/vovakaruxilatituj.pdf
    • https://cdn.shopify.com/s/files/1/0435/1347/9320/files/36303595571.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/68158117910.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/sirizesobo.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_off00008184.bin
5c9e5a59665096d156babaabbef79cb7175f29533c35536329a9cf0a8d8bbc8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8184 4844 bytes
font_01_sfnt_off000091ea.bin
4c5d34ca4f8deacf270bfb5206138cd0735de44c627920d1b5a9480849171b88
pdf-font-stream PDF embedded font (sfnt) at offset 0x91EA 16040 bytes