Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ab635ad1ccc3a1…

MALICIOUS

PDF

52.0 KB Created: 2020-08-23 18:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da6fbd58027a384ea6a70682bdfdf1ef SHA-1: 0f7d8fdd4f75c9e893baaa279b9106f82714f992 SHA-256: 37ab635ad1ccc3a1c0be553315af941334b121223ef879ff9082d853d4fe6a42
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF contains a significant number of embedded external links, identified as a link farm. One of these links, 'https://ttraff.com/pify?keyword=parachute+or+brooklinen+linen+sheets', points to known malicious redirector infrastructure. The document body itself is heavily obfuscated but contains this URL, suggesting the primary purpose is to lure users to malicious sites. 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.com/pify?keyword=parachute+or+brooklinen+linen+sheets
    • http://zoxafis.valleybasegear.com/uploads/1/3/1/1/131163664/1962729.pdf
    • http://pubifiv.lenisewilliams.net/uploads/1/3/2/6/132695839/3511252.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0285/files/spatial_database_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/7619/8305/files/zitamov.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/armed_forces_tribunal_act.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/87967481005.pdf
    • https://cdn.shopify.com/s/files/1/0464/8573/3528/files/chori_chori_tere_sang_dj_song.pdf
    • https://cdn.shopify.com/s/files/1/0461/6306/7032/files/blue_bottle_chemex_brew_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/4203/8182/files/19096302334.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/zanomonibubidezuxaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/nutojomawovowesu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3214/files/99487754273.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_off000080fd.bin
ef7b9ac22ec489ef374eb4071b57a0424ce9c92fba494d54e1b7274a9e2f4e3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x80FD 4972 bytes
font_01_sfnt_off000091ca.bin
7db262a8aa5b41e75f22877a6cf405a0dfdef4a224d26f054d3d38a8a43338f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x91CA 10324 bytes
font_02_sfnt_off0000b522.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB522 4324 bytes