Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f41b864bb9f59be…

MALICIOUS

PDF

40.7 KB Created: 2020-08-29 21:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1484ca453d84f9ae4fc6faa66fce9056 SHA-1: d7c4002a3e6c53d9a4d586169a12d30eead54c58 SHA-256: 4f41b864bb9f59be1318bf6b6430251ebd5ff5b5fdee24ccbbb5d3f6fcada2a8
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link directing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Insten sim card reader driver', suggesting a lure to download potentially malicious software. The ML classifier also strongly indicated maliciousness.

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=insten+sim+card+reader+driver
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/fobotusobitonotujimabupag.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/togojopajixiz.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/l_carpetron_dookmarriot.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a29c14bffb44ce28fe3157b1f5f3a50.pdf
    • https://static.usrfiles.com/ugd/d17951_321948676b114db78a73bcff461d58ec.pdf
    • https://static.usrfiles.com/ugd/6116da_6157dd0e77694419a4cfc13dab346dba.pdf
    • https://static.usrfiles.com/ugd/58a813_1b368950dcbf4498988599f89259d091.pdf
    • https://static.usrfiles.com/ugd/b8c837_1276160a6c1640e9867112061de85892.pdf
    • https://static.usrfiles.com/ugd/374ce0_e74ff278b75e418b8bcd1d784719257c.pdf
    • https://static.usrfiles.com/ugd/b8c837_823f16bd4e6a43ed96410974cb865342.pdf
    • https://static.usrfiles.com/ugd/a58b01_6c8bb07637624cb8a5bc949c6ea3f9a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_46e135fdbf8d4fa8bee14fc6ceb14922.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0885/files/puwapamawipobotutevevut.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3795/files/fevenoxuzosobabub.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_off0000602d.bin
8704bca8365b36a0849d0d91c2ac3e960cf6ec7c5160ada81c3973f4ad63831f
pdf-font-stream PDF embedded font (sfnt) at offset 0x602D 5048 bytes
font_01_sfnt_off00007139.bin
aa406bec99a53dea7368d27977ebd0324561bf1d34110dd0ddb9756aa33359de
pdf-font-stream PDF embedded font (sfnt) at offset 0x7139 10888 bytes