Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9385e7c4f4538d3…

MALICIOUS

PDF

39.4 KB Created: 2020-08-08 07:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca70dc53eddfbafb74621df1cd744ded SHA-1: cd2799d06c85d7e860288409c77bb83acab3be61 SHA-256: a9385e7c4f4538d33e052016c3e8b96b068be74c5c7314ee33f84e18ba9742d6
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is disguised as an accounting diagram. This suggests a phishing or social engineering attack aimed at redirecting users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the malicious link is sufficient evidence for this assessment.

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.cc/pify?keyword=accounting+cycle+diagram+pdf
    • http://files.australasianhumanbiology.com/uploads/1/3/2/7/132741029/komore.pdf
    • http://files.cremedelacremecakery.net/uploads/1/3/0/7/130775432/pupajelivix.pdf
    • http://files.getmeintouni.com/uploads/1/3/2/3/132303019/fakokelewaba.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/44053518778.pdf
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/mobydick_2_hacked.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/unified_remote_server.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0521/files/14383199462.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2943/files/minidibeped.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/2477069113.pdf
    • https://cdn.shopify.com/s/files/1/0433/8742/0835/files/2885759774.pdf
    • https://cdn.shopify.com/s/files/1/0430/3234/6773/files/61127195354.pdf
    • https://cdn.shopify.com/s/files/1/0438/3988/1373/files/47082066681.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1871/files/agamenon_completo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0529/files/707793135.pdf
    • https://cdn.shopify.com/s/files/1/0447/7186/8821/files/pneumatic_symbols.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_off00005dff.bin
6a066f09ce504e7c4e3b334f7d997742ade59f3743a8543dd43f871d37e4df00
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFF 5388 bytes
font_01_sfnt_off00007047.bin
f206576c3a48b2dbc7132064b08ccea2f6e9568f2f8539a73f1e210bed05c06a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7047 9640 bytes