Malicious PDF — malware analysis report

Static analysis result for SHA-256 39efeca39314ee99…

MALICIOUS

PDF

46.4 KB Created: 2020-08-23 06:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f107c8acd96ba882b2d7f068716e2adc SHA-1: 71e8e0f4c37e56e05e5791951943871fb62857f3 SHA-256: 39efeca39314ee99452fd70002af33059dcd0b7a5091f12c02bdf573e63323d6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

This PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify-hosted PDFs. The primary malicious URL identified is ttraff.com, which is likely used to redirect users to further malicious content. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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.com/pify?keyword=hedonismo+psicol%25C3%25B3gico+pdf
    • http://bojizi.richardaoun.com/uploads/1/3/1/3/131398024/jowizanuxabuvef.pdf
    • https://cdn.shopify.com/s/files/1/0429/8588/1753/files/gagisuzewidemosenojow.pdf
    • https://cdn.shopify.com/s/files/1/0435/6151/7217/files/15067208951.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/60076532072.pdf
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/xawabikujeluvarosusavapu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/65432227723.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/small_size_reader_apk_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/42986921629.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/la_noche_a_traves_del_espejo.pdf
    • https://cdn.shopify.com/s/files/1/0463/0754/1149/files/42536178819.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/muporotivobixeb.pdf
    • https://cdn.shopify.com/s/files/1/0444/6345/6423/files/convertidor_analgico_digital.pdf
    • https://cdn.shopify.com/s/files/1/0434/0049/5260/files/22515605418.pdf
    • https://cdn.shopify.com/s/files/1/0432/5919/9650/files/924473034.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_off0000742d.bin
8724034a4f19d4b746c81159d3ea5b044cfc2c9d359387c814eb85ae59a519ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x742D 5264 bytes
font_01_sfnt_off000085c9.bin
0ed6be61f89d6d4f734dd5c9927863358298a6e0470aebdc2c2ca0f4ffaf9e4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x85C9 11844 bytes