Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef08d2dccefe17d…

MALICIOUS

PDF

40.5 KB Created: 2020-08-29 23:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb0032b36868e9b960ab4af33697a2a0 SHA-1: 52afa54011f2e3d20059b975effb7d45a55c739d SHA-256: 9ef08d2dccefe17d55c4f07b3f73a5cd0bdaaeee4b9b0ad4f98aa0978a6639a3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com). This indicates a link farm designed to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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/wix?keyword=vicios+del+lenguaje+barbarismo
    • https://static.usrfiles.com/ugd/09273f_b502ae2218db4e7d93e4d0b648d32797.pdf
    • https://static.usrfiles.com/ugd/3f80ec_dd1af3bd92bc4ca69baa877c13c85fd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_914e50164efb4cff885d8ec87f55bdec.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a12568969754dccaee4bf1f88b6d39a.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/nutrition_therapy_advanced_counseling_skills.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/administrao_de_medicamentos_via_intramuscular.pdf
    • https://cdn.shopify.com/s/files/1/0434/6563/8048/files/renej.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9383/files/minecraft_tower_defense.pdf
    • https://static.usrfiles.com/ugd/f1780b_06fd66a5213b48c9a58284278f5a6492.pdf
    • https://static.usrfiles.com/ugd/6a7407_951b1207dd5149afabb55faf04e46e21.pdf
    • https://static.usrfiles.com/ugd/76156b_3ead645e2c21402e8649d005f4a8af81.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a4cd7e5bdb84ac685d4471abb899625.pdf
    • https://static.usrfiles.com/ugd/b8c837_d12793fc1aaf4298be788ef70539a1b2.pdf
    • https://cdn.shopify.com/s/files/1/0437/0913/7049/files/notizino.pdf
    • https://cdn.shopify.com/s/files/1/0450/0425/9492/files/sujowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/clean_room_design_book_free.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_off00005e98.bin
504584c28c9e2adeadb77753a465ba40b3a2fdc498cc9fb374fc76652bec1e45
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E98 5440 bytes
font_01_sfnt_off00007100.bin
55cf149e3c2439cf1b560f5d04292ae96e74ff72b8e7fd17084d9352546ed852
pdf-font-stream PDF embedded font (sfnt) at offset 0x7100 11564 bytes