Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc827ccf164c4b74…

MALICIOUS

PDF

47.8 KB Created: 2020-09-07 16:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6525258b46a9155adbe44bbd06a8613 SHA-1: 2d4c33b88b5399879f917a74cf7c783df713f565 SHA-256: dc827ccf164c4b74969b874fcb8b9547938bcae7c469c44af30c22bfbe1288df
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.me/wix?keyword=mcdonalds+questionnaire+answers+2019'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The ML classifier strongly indicates maliciousness. The PDF is likely used as a delivery mechanism for a phishing or malware-spreading campaign.

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.me/wix?keyword=mcdonalds+questionnaire+answers+2019
    • https://static.usrfiles.com/ugd/63022f_2297722c144c4993a1010ff1563645b7.pdf
    • https://static.usrfiles.com/ugd/895bef_1e1912ddf3814fc990343990a94845f3.pdf
    • https://static.usrfiles.com/ugd/99afdc_8bb54967309e4536a1802dd04ab307c6.pdf
    • https://static.usrfiles.com/ugd/b3bc21_7ee02b919b9944cd8753f4e0d5bbac37.pdf
    • https://static.usrfiles.com/ugd/b8c837_a41edc31688c40e2b1253604609abc88.pdf
    • https://static.usrfiles.com/ugd/ca300b_1be9b0db9707469cabf64dc9e7c43985.pdf
    • https://static.usrfiles.com/ugd/70a38d_2cfe1686b86f426ead446a59a9587121.pdf
    • https://static.usrfiles.com/ugd/008e52_bab54909df104ea1b42f43bb56644b5d.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/barbie_doll_telugu_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/7590/3383/files/site_reliability_engineering_o_reilly.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/93131512992.pdf
    • https://cdn.shopify.com/s/files/1/0447/0479/2729/files/introduction_to_forensic_and_criminal_psychology_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/dozas.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6799/files/xivobuzalimof.pdf
    • https://cdn.shopify.com/s/files/1/0433/4105/4105/files/guximuwemapumerevosef.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/
    • https://static.usrfiles.com/ugd/b8c837_a

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b89.bin
b0a37684d0fc39ecad21003bb869d16759cad5fb53b64b43c583bd1f0cd9da38
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B89 5640 bytes
font_01_sfnt_off00008ee3.bin
533db15f3f65635ec495aad752e1681b534d68d61724401105ba7a6fcb95970c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE3 10256 bytes