Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bce2dc6f9718233…

MALICIOUS

PDF

96.0 KB Created: 2020-09-10 09:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2e74a9ac83e272845f3b69ad6750086 SHA-1: 01adfc7949d4057de1b847978babe80dc283f51a SHA-256: 2bce2dc6f9718233b8dab203df925afd538c88fd9691cff2889299def5157b6c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Bosch washing machine user manual' and the malicious URL, suggesting a lure to drive traffic to malicious infrastructure. 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/wb?keyword=bosch%20bula%C5%9F%C4%B1k%20makinesi%20kullanma%20k%C4%B1lavuzu%20pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3552/files/kanepekefesopuzaluxiko.pdf
    • https://cdn.shopify.com/s/files/1/0459/1222/7989/files/34752669713.pdf
    • https://cdn.shopify.com/s/files/1/0431/9153/3725/files/anti_blue_light_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/problems_on_ages_questions_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/windows_media_player_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/74613890248.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8242/files/rockstar_movie_utorrent.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0802/files/ingersoll_rand_telehandler_service_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dbd7efa4fa7415da0ee8d929faab59a.pdf
    • https://static.usrfiles.com/ugd/2ac701_d472bdd15cb548c7bef2cdb4f2887d32.pdf
    • https://static.usrfiles.com/ugd/b8c837_afee9af970f54e318101ba4a7c456c42.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_off00013645.bin
f5ef8cf52008498b604b104934a84f6e6795c912fd8c520e1480743fb33214d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 5940 bytes
font_01_sfnt_off000149f4.bin
266a173b1b5b6915f492847897af18700af78997bd0631a004570e6422d662d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x149F4 12416 bytes