Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b37d97abe414ada…

MALICIOUS

PDF

43.6 KB Created: 2020-08-26 06:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a8a8e57d2cacd397d8722d7d479d23f SHA-1: 0151deebe75fbffebe2c91fa3f9059fc8fef1aff SHA-256: 3b37d97abe414ada36687fa9a5243dc0d75de5ed6c9baff597bb0aeed241150b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. One of the primary links, 'https://ttraff.ru/pify?keyword=abendsegen+noten+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=abendsegen+noten+pdf
    • http://files.meliadf.com/uploads/1/3/1/4/131408062/013d96a893128e.pdf
    • http://pevovudep.mycphoa.com/uploads/1/3/2/7/132740805/nijuf.pdf
    • http://gazol.conniecycling.com/uploads/1/3/1/4/131454950/direwokog_zemajipo_gewilazedi.pdf
    • http://zujoboni.mercedesclubindia.com/uploads/1/3/2/3/132302780/jixekivu-viridaxefo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/3056351610.pdf
    • https://cdn.shopify.com/s/files/1/0440/5533/0981/files/92638702690.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/a_rocking_horse_winner.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1277/files/tasufadifodofigam.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/whatsapp_gb_beta.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/animedroid_apk_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/jewigi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1575/6181/files/2543071644.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/62521094166.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/baby_girl_song_video.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/military_alphabet_codes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/laser_printer_vinyl_sticker_sheets.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_off00006c06.bin
2e44e30c9a5c36be909de6b5844cc7fde355b80808e0af7a58695af96e859253
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C06 5000 bytes
font_01_sfnt_off00007d1c.bin
2b144ea487d909d0f193cb8d856dcfb5e0e4dc1ad1ccefb8e61327efac7967da
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D1C 10940 bytes