Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da94b53680fa33f…

MALICIOUS

PDF

46.2 KB Created: 2020-08-31 12:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: facc59aaead8ce474ef5b521a10bed2a SHA-1: f653f8456aaeebfb8d3db17884c2a7b96e6fac66 SHA-256: 4da94b53680fa33f88d71e05ec9b487aa9206da86ba756979c3e3d9a4287088b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a user manual, directing the user to click the malicious URL. The ML classifier strongly supports the malicious nature of this PDF.

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=coolpix+l100+user+manual
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/67019192362.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/recipe_for_apple_google_feud_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/32981102860.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2dc94cbac1740c5a09c1362aa8ed58d.pdf
    • https://static.usrfiles.com/ugd/b8c837_25286c4c53824c33bd323f6e63ff0e53.pdf
    • https://static.usrfiles.com/ugd/b5472a_01f714f5b1c14e1bbeef5164203df88f.pdf
    • https://static.usrfiles.com/ugd/f1d680_15f002cf15c44e2e9cdb173f1fdce99b.pdf
    • https://static.usrfiles.com/ugd/2c8d66_cbc434821ba84523b74d4b6583db3ee3.pdf
    • https://static.usrfiles.com/ugd/b8c837_809268f63d4f4e25bc8ca7711807b741.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/the_architect_s_handbook_of_professional_practice_student_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/52705742991.pdf
    • https://cdn.shopify.com/s/files/1/0433/4095/5803/files/nozofodogarizapadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/buturixuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/banoxonezafawu.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_off00006d48.bin
ec708934c8994d4a733a9e55ee11c74c097b262ab1fdd48024e87b53bc0552c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D48 5132 bytes
font_01_sfnt_off00007ead.bin
725f164af8b9d5da6ee64054e8752c0fd79a350eb5e8f8dffa41d0706693520d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAD 14760 bytes