Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd9bdf6b4f8649f…

MALICIOUS

PDF

41.4 KB Created: 2020-08-21 00:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e869a1fce4786138b9d2e94fd585085 SHA-1: 2accefeaf5dc191e98220784501b7dbf6292303e SHA-256: 8fd9bdf6b4f8649f00f15ddd70a3a28cce6cf6d6487a396826450f42436df9df
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, including a redirector link to 'ttraff.cc' which is flagged as malicious. Additionally, it features a large number of links to external PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the extensive linking strategy is the primary attack vector.

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.cc/pify?keyword=salvado+de+trigo+grueso+informacion+nutricional
    • http://fosaruga.watips.net/uploads/1/3/0/7/130739046/nezuxiwa-kisokori.pdf
    • https://cdn.shopify.com/s/files/1/0437/7804/8161/files/geomorphology_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/daily_use_english_words_with_meaning_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0524/5597/files/derajat_asma_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4741/files/myers_briggs_online_personality_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/gokivisapumatiguzi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/git_download_branch.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/ankusham_video_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65939759823.pdf
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/83690544336.pdf
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/office_depot_san_carlos.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_off000050fc.bin
36133c01695a8d02bbaee3fe94a54dc8bf6901d50faa7016e60759d992a0fcae
pdf-font-stream PDF embedded font (sfnt) at offset 0x50FC 5384 bytes
font_01_sfnt_off0000632f.bin
781ac29fc988220529b57996dc3dc058240dd7c39b688227c9f1856cc15fff63
pdf-font-stream PDF embedded font (sfnt) at offset 0x632F 11624 bytes
font_02_sfnt_off00008911.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x8911 4324 bytes