Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6bd167a6c86105…

MALICIOUS

PDF

40.0 KB Created: 2020-08-31 20:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e8e354abc61bf1c5ce12d41824acf92 SHA-1: be25762048cf080fe15de1edb726a3cb109e4b87 SHA-256: da6bd167a6c86105b6060c0c83a380490cdac709be39089e5d54ccd58eb1040d
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify and static.usrfiles.com, but one critical link directs to a known malicious redirector at ttraff.ru. This redirector is likely used to obscure the final destination, which is probably a phishing or malware distribution site. The document body, though heavily obfuscated, contains the malicious URL and text related to a game download, suggesting a lure to entice users to click the link.

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.ru/wix?keyword=sengoku+basara+game+apk
    • https://cdn.shopify.com/s/files/1/0439/3215/6059/files/83126035612.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/nadadatusimejifure.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/25402543568.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9653/files/bilirrubina_directa_o_conjugada.pdf
    • https://static.usrfiles.com/ugd/b8c837_350d0a29eb0c4a69bdebba7ef5a12e24.pdf
    • https://static.usrfiles.com/ugd/ac72e0_4e48bea3aaa84440b7e015829154e60a.pdf
    • https://static.usrfiles.com/ugd/f103bb_a92a0d5c016f4271a14dc18307a1bfc8.pdf
    • https://static.usrfiles.com/ugd/a8ca0f_fe98bbe733424aba880d5c0f7f6885ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_736f5ea4b2b1488188eed9c4b98ec757.pdf
    • https://static.usrfiles.com/ugd/67f5f7_421040c7441b47bbb318f0c7cf3de5c4.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_e00a67695c0d49df80cc7b6874db69fb.pdf
    • https://static.usrfiles.com/ugd/868401_f46c7fed96044fa5904d3711ccef56e8.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_off00004b6a.bin
36d8c451810b5af81c994aaba46161d40760f8b3773d9b3df4f844c503f2577e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B6A 4928 bytes
font_01_sfnt_off00005c1a.bin
5523a934f22a959cc1c9ff5b5da6e3c18bba7c955e3fcf97a6533c4a764e57cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1A 5416 bytes
font_02_sfnt_off00006e6f.bin
d0555d806d0770e09bd529c21e6f1b71ffa02e8cd9844e54a8a8f7a86e59436a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6F 10444 bytes