Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d1f31e39223486…

MALICIOUS

PDF

53.7 KB Created: 2020-08-30 21:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3407ea8b2ca1841713c8aeb7e7b3be18 SHA-1: d08aa9dd5688dc2a2b5070fec2d775b79edcf27e SHA-256: d6d1f31e39223486d0a7bf3af90fe13061e7a5ecd1446e7cc01ae51a06c5d9b8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a search result for a technical query. This suggests a phishing or scam attempt. The document body, though heavily obfuscated, contains the malicious URL and other URLs hosted on cdn.shopify.com, which are likely part of a link farm to improve search engine ranking for the malicious content. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=jquery+ajax+submit+form+get+response
    • http://twitter.co.a
    • https://cdn.shopify.com/s/files/1/0431/8694/6212/files/hairy_maclary_story.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bukidesokat.pdf
    • https://cdn.shopify.com/s/files/1/0438/0108/4064/files/74595976473.pdf
    • https://cdn.shopify.com/s/files/1/0435/8560/1693/files/44672411902.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/37538227404.pdf
    • https://static.usrfiles.com/ugd/07625c_c2d09ff83fd44a368e75520aa18cbaa6.pdf
    • https://static.usrfiles.com/ugd/ec0c41_57cda199319247dab69df48d5914c137.pdf
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/explaining_reformed_theology.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/70337607563.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/xefavetuzepipesoxujuvam.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/plt_save_image.pdf
    • https://cdn.shopify.com/s/files/1/0434/7104/4770/files/64825710931.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/piboramovolunarabefow.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_off000091b8.bin
88c591a498686bc0dc05be08409fde912e152b57f3a136627caaf3c5b5bd4357
pdf-font-stream PDF embedded font (sfnt) at offset 0x91B8 5692 bytes
font_01_sfnt_off0000a514.bin
fdcf61217c5060ccbab9ae69b4f3f86b62d5d4839c967f6cb2b2bf2a39d755e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA514 10912 bytes