Malicious PDF — malware analysis report

Static analysis result for SHA-256 38aa48a5f5027b45…

MALICIOUS

PDF

40.0 KB Created: 2020-09-02 11:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 338acf88b3030b1c304b70a947872856 SHA-1: a1c966863b2d829cb986a2ae818490b9eda505a6 SHA-256: 38aa48a5f5027b45d9bc316f3e7787df345d9ea718419fb77424257db1cb6466
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URL https://ttraff.cc/wix?keyword=bson+objectid+format is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and numerous other links pointing to external PDF files, suggesting a coordinated effort to distribute malicious content.

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.cc/wix?keyword=bson+objectid+format
    • https://static.usrfiles.com/ugd/0b46e6_b7ba9b46bc8644b0ad4de49b38887952.pdf
    • https://static.usrfiles.com/ugd/3aca14_176b9882b1ef4a93bc42a0eb2ef0b826.pdf
    • https://static.usrfiles.com/ugd/b8c837_265f266e688f4bf7bd1c5f8275d824ef.pdf
    • https://static.usrfiles.com/ugd/756799_3752293141a74bc3b7192614bad1723b.pdf
    • https://static.usrfiles.com/ugd/b8c837_321a160ba6674138a1b9479bc20edcbe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/85616640059.pdf
    • https://cdn.shopify.com/s/files/1/0436/6378/6137/files/52013152963.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/steven_universe_season_2_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/7174239201.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/40549802646.pdf
    • https://cdn.shopify.com/s/files/1/0464/9854/5822/files/pofowo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3118/files/soduv.pdf
    • https://cdn.shopify.com/s/files/1/0446/2054/6211/files/cambium_ptp_550.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7750/files/dimuko.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_off00005d96.bin
d45e2058da563c5de8927c7bd6cc442ec9f1903127523ced2fee92fa58fcf3c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D96 5400 bytes
font_01_sfnt_off00006fe0.bin
eeaeb9bce9406e2ab68c70329281c40913e5c6f65a1b1c1aeba7ce04d663d200
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE0 10776 bytes