Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac24d4f01c0d4d7e…

MALICIOUS

PDF

39.3 KB Created: 2020-08-31 10:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efada76aef548b13c37c2eafd288a6e1 SHA-1: a527015a84a74122678402a16883f1463c5ed3a2 SHA-256: ac24d4f01c0d4d7e6fbce9b4228e72a9d17ddf25d621e06a9967a158897d9037
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://ttraff.ru/wix?keyword=gravity+falls+journal+3+limited+blacklight+edition'. This indicates a social engineering attempt to lure victims to a potentially harmful site. 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/wix?keyword=gravity+falls+journal+3+limited+blacklight+edition
    • https://cdn.shopify.com/s/files/1/0437/7578/7157/files/35120028336.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/patawumogajizi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1770/5371/files/945355743.pdf
    • https://static.usrfiles.com/ugd/a86d68_7320d5cf8a054ef682ec19dd65239a9a.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_c29f706805574afc99ea085e2f918099.pdf
    • https://static.usrfiles.com/ugd/37321e_d55fd7010fd4477aa346311b99a94797.pdf
    • https://static.usrfiles.com/ugd/3615fb_1c260d2b3b3145e69aa430f601d110ec.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/absenteeism_article.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/rakafudejomapulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/bunimeguminosapijibo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/83443257321.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/86695965790.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/biochemistry_mcq_for_medical_students.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3593/files/37253510177.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ad2.bin
dd2483b32fe961620a2268399e03c3d9dcd91d4a829a1dccf0651b92bba18cf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD2 5952 bytes
font_01_sfnt_off00005efb.bin
4ce33f896ac0bd9769058fde4adc43347b2a3352c171760ff0d04b82a2d337a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFB 10268 bytes
font_02_sfnt_off00008214.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8214 4324 bytes