Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd3ae460658657e…

MALICIOUS

PDF

40.7 KB Created: 2020-09-18 09:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18a609a391b8e85a996da06b0c1978bd SHA-1: fc1498a945a16cddf09e4256f52209a065e91e86 SHA-256: 9bd3ae460658657ebdfde51fa5fe81f8c761e701d0469d78580d19ed4f211250
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.me/wix?keyword=writing+linear+equations+word+problems+worksheet', suggesting a lure to a malicious site. The presence of numerous other links to Shopify, while some are benign, contributes to a link farm tactic. 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.me/wix?keyword=writing+linear+equations+word+problems+worksheet
    • https://cdn.shopify.com/s/files/1/0440/5765/7509/files/taylor_swift_red_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0431/6387/7537/files/answers_in_genesis_science_books.pdf
    • https://cdn.shopify.com/s/files/1/0483/9315/8808/files/noritexusemo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5291/files/81451698992.pdf
    • https://cdn.shopify.com/s/files/1/0431/9664/5538/files/balanced_scorecard_advantages.pdf
    • https://cdn.shopify.com/s/files/1/0435/8461/8653/files/40844875458.pdf
    • https://cdn.shopify.com/s/files/1/0435/0381/2773/files/mabuvaniw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/15290728610.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/48025182001.pdf
    • https://cdn.shopify.com/s/files/1/0441/2129/2952/files/revenue_analysis_report_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4920/files/blood_type_a_negative_diet_food_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/8257/0136/files/91796140084.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/sezukomiwu.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_off00005220.bin
4250367af4cff92919ce1525aea722e4f1cc98ab376520f4d1a0af31ad886a6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5220 5692 bytes
font_01_sfnt_off00006555.bin
557f39bf368a58c6320e5d3eb86a259f3855ffbc3e32fa573dfde2f33c96b199
pdf-font-stream PDF embedded font (sfnt) at offset 0x6555 9980 bytes
font_02_sfnt_off0000878f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x878F 4324 bytes