Malicious PDF — malware analysis report

Static analysis result for SHA-256 13258d15fccb501f…

MALICIOUS

PDF

41.1 KB Created: 2020-08-15 12:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b14a5de399152349d1cd949f95cbc366 SHA-1: 3f4b8f66cecb6f988ee13c430c68124fa8f5e1fe SHA-256: 13258d15fccb501f4363f3081e000455fc0f7d4e5d2c3a0bc2fd835be80f8308
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting a lure related to 'time management worksheet doc'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the true destination. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=time+management+worksheet+doc
    • http://gugel.vabeachsa.com/uploads/1/3/0/8/130874019/sotokejuti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1955/8299/files/ipl_2020_schedule_full.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/stardew_valley_hidden_achievements.pdf
    • https://cdn.shopify.com/s/files/1/0434/2241/7047/files/letter_a_worksheets_for_toddlers.pdf
    • https://cdn.shopify.com/s/files/1/0436/6961/8841/files/mifaruj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/59132919401.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/45063703291.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6949/files/suziridukujovujivo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1007/2481/files/watopi.pdf
    • https://cdn.shopify.com/s/files/1/0454/8116/4950/files/carian_cole_torn_espaol.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_off000062eb.bin
38d265df1e5844baa05cf1be086a7f2fcd7a70bff1a94480a797cbf794a24fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x62EB 5428 bytes
font_01_sfnt_off0000753d.bin
decc87123f662417948910fed5403ff17b4154fccc54b5808d413e0bcc976c00
pdf-font-stream PDF embedded font (sfnt) at offset 0x753D 10124 bytes