Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a91a31af85466a5…

MALICIOUS

PDF

41.0 KB Created: 2020-09-04 19:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4657843abf4102e5e15111682c09565 SHA-1: 3487d9229b41f8cf582ed04f1477a8778ff3b833 SHA-256: 6a91a31af85466a5619bb9b25bd55058aa9c789ce3974187245c0833a937150c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.me'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of a 'download button' heuristic further supports the phishing pretext. No scripts were extracted, but the PDF's structure and the malicious URL indicate a phishing attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=bibtex++windows+7+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9870/1977/files/seninegipatere.pdf
    • https://cdn.shopify.com/s/files/1/0433/0828/6105/files/annual_free_credit_report_site.pdf
    • https://cdn.shopify.com/s/files/1/0433/8866/6017/files/pathophysiology_of_fever.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8541/files/44661303165.pdf
    • https://cdn.shopify.com/s/files/1/0441/0051/8040/files/luvolotaki.pdf
    • https://cdn.shopify.com/s/files/1/0439/0040/3880/files/51535574150.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/parawo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2806/8005/files/manual_msa_aiag_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/55119533701.pdf
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/get_attributeset_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0137/files/rofadononedosimiliro.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/sivetidi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/bukidiwagaxuxolemiwimipud.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006081.bin
c65a8197d6cce8396b9dc481188ea3fcce98873228e677fea12d3ed698600799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6081 5088 bytes
font_01_sfnt_off00007201.bin
b427a91f6d7c091a690cd5d060c46036e86253b03cb53ee8860bf63989e562b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7201 11064 bytes

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