Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a35fdd7d8335ba8…

MALICIOUS

PDF

45.3 KB Created: 2020-09-02 00:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ecb7d161df06e8dd65aee38ce1c0369 SHA-1: cc75dcd73f618fc6aa122b400089d794f4b1642c SHA-256: 2a35fdd7d8335ba89e4f77f4719d7cbe0d02419eedb91632d9e76034917c0b46
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'business plan sample' and includes the malicious URL. The primary attack pattern involves luring the user to click the malicious link, likely leading to further compromise.

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=business+plan+sample+for+small+business+pdf
    • https://cdn.shopify.com/s/files/1/0434/4152/0805/files/30656303389.pdf
    • https://cdn.shopify.com/s/files/1/0430/9785/0010/files/koala_bed_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0461/5084/4579/files/10931753220.pdf
    • https://cdn.shopify.com/s/files/1/0437/8309/4434/files/applied_mathematics_1_mumbai_university.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/16168214882.pdf
    • https://static.usrfiles.com/ugd/23e9be_881325eddb8742698459aa288fa18c23.pdf
    • https://static.usrfiles.com/ugd/5cd33b_ff016645138243659915f48393bd43a4.pdf
    • https://static.usrfiles.com/ugd/217b8a_781d05bdd8fb4208bf77aa1520ef16da.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cf5edf5860d40fcbf249016672c4539.pdf
    • https://static.usrfiles.com/ugd/ea2f88_195b046fbf7047bca181bed5ee98bb87.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad796a46abf149ef8058e49501923ca8.pdf
    • https://static.usrfiles.com/ugd/ef7b09_b90a2c3a87c74a0890825351459bd228.pdf
    • https://static.usrfiles.com/ugd/4d400c_48d0d81e6ba349fb8cc98fac0b1cabeb.pdf
    • https://static.usrfiles.com/ugd/6d59ab_f3e36f9e320c4576b0fa8fe6f4843432.pdf
    • https://static.usrfiles.com/ugd/f3cb45_76bd054d66174e37bb47caadb1379f5a.pdf
    • https://static.usrfiles.com/ugd/8a419d_ebcd81dfd94b4905a12ca35cc61d0164.pdf
    • https://static.usrfiles.com/ugd/704566_0488591c19e44d8d960fa9b99c803932.pdf
    • https://static.usrfiles.com/ugd/b8c837_535d5e5d905d4592bf1b433bcf1437bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcf8782af44b4518881e0c9c9d18b526.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_off00007263.bin
5e9800a0e5397a56041b7ac6f9219428a8a0e1952f5cf0c2506c6a98bee22c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7263 5376 bytes
font_01_sfnt_off0000848f.bin
be6f096cf169bf3f6a91c70b5ffa450fceecf67541680b99e6e33f209b7c1aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848F 10684 bytes

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