Malicious PDF — malware analysis report

Static analysis result for SHA-256 637596ba8c509f8f…

MALICIOUS

PDF

36.1 KB Created: 2020-08-28 00:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7de5062ca7e16183910d0976dca95434 SHA-1: 604b0ae52038b781c7a3bc7dbea8295957fc9285 SHA-256: 637596ba8c509f8f5eb78dfb6fb3770166db3f8f626fec8469954d84df9645cd
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=gregg+braden+gratis'. The document also features a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute further 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.ru/pify?keyword=gregg+braden+gratis
    • http://pivovu.gordonstounartandphotography.com/uploads/1/3/0/7/130738948/mowazeworat.pdf
    • http://bizafuj.rehobothchildrenstheatre.org/uploads/1/3/2/6/132681495/jugowodubemu-vewolofoli-loduwalagox-pinawo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30551251375.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/chainsmokers_closer_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/5771/6117/files/rolijajonowuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/jawaborezov.pdf
    • https://cdn.shopify.com/s/files/1/0428/6405/0332/files/poe_ruthless_multistrike.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/mukubanikumumili.pdf
    • https://cdn.shopify.com/s/files/1/0428/4029/3543/files/12516995618.pdf
    • https://cdn.shopify.com/s/files/1/0439/3893/9048/files/ielts_writing_task_2_sample.pdf
    • https://cdn.shopify.com/s/files/1/0438/5295/5810/files/muparedizajikujowoxorose.pdf
    • https://cdn.shopify.com/s/files/1/0437/9623/4400/files/echo_show_5_instruction_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/bavuxopuxavusosapem.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_off00005094.bin
144499dbaf569b6471de05b9f3a4d2b657fa5f245142987392396f912b0d252a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5094 5132 bytes
font_01_sfnt_off0000621a.bin
a1be56517993c8d371c18ad8cde73209c1bc797a5fbe5a0f35ff90cff62d6d66
pdf-font-stream PDF embedded font (sfnt) at offset 0x621A 9904 bytes