Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4e36f33720f9fd…

MALICIOUS

PDF

46.2 KB Created: 2020-08-31 02:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 127220252202ca553d96f6df2cbfeb3b SHA-1: 8d9b00ad69e35efdc7d5aac8fde00ef65c5e47e1 SHA-256: bd4e36f33720f9fd484585a9323c854c47a622589482f5a271624d12a7195f2d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to malicious sites. The document body, though heavily obfuscated, contains the same URL and text related to Mexico, suggesting a lure. The PDF also hosts a large number of external links, many pointing to static.usrfiles.com, indicating a potential link farm or distribution mechanism.

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/wix?keyword=mexico+un+pais+rico+en+especies
    • https://static.usrfiles.com/ugd/b8c837_2b5273dffdb441f7a8ceb13b5a741aba.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_00cbc1f3647747f8b42a6d4845c7fa81.pdf
    • https://static.usrfiles.com/ugd/b8c837_26723bdd42ba4dfeac0a42e57f3c7f1a.pdf
    • https://static.usrfiles.com/ugd/628a76_2d8aef387f524c15ba8a2a92dba8ee67.pdf
    • https://cdn.shopify.com/s/files/1/0438/2995/2674/files/algebra_2_practice_problems_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3241/2311/files/automation_anywhere_control_room_10._3.pdf
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/jovapaberusupikomokamira.pdf
    • https://cdn.shopify.com/s/files/1/0457/8669/3798/files/podajawawefufuzador.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapitawaluzosamorexub.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/68276641241.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2988/files/menolururegagitawafikotem.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca7214c10c1b47438db081708e9ff2ce.pdf
    • https://static.usrfiles.com/ugd/a18aa6_26f41e8387d44b0e944ac05c01232bfb.pdf
    • https://static.usrfiles.com/ugd/9ea91e_434ac05dcd9c4068bb29c50115ed9b50.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_off0000744e.bin
4d15ff77aeb3c0f64024aad93f2b195c0a5150534f2989f88e7ad9dcf20f7e8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x744E 4968 bytes
font_01_sfnt_off00008546.bin
dc7276d5b52fb53677655c2d081b7bc655093d0c8b96a5d2413abd6638a497d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8546 11332 bytes