Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddd77a9fab7dac5…

MALICIOUS

PDF

46.5 KB Created: 2020-08-29 05:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 627ec4e84b81b5fcea392399cb7f96d9 SHA-1: 167586ce696be0746fe7d0e7684a56d03d2c8633 SHA-256: dddd77a9fab7dac531cb66cf9290ad247de940d6c571274b489899f15a14e833
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic identified a link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the same URL and references to chemical engineering, likely as a lure. No scripts were extracted, but the primary malicious activity appears to be directing users to malicious infrastructure.

Heuristics 3

  • 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.
  • 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=introduction+to+chemical+engineering
    • https://static.usrfiles.com/ugd/b8c837_1398ee65aaa34f92b29ee2abb46b524d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7d901285f5b407ca264dc20b77830cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_02c4beb5bb1e448ebdd2f8dc0198b64f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad908162b8fe44ed80bf2d3668d8be69.pdf
    • https://static.usrfiles.com/ugd/b8c837_54b90e902b8b4aa9ade104185c577f00.pdf
    • https://static.usrfiles.com/ugd/b8c837_edf34281e076497fa78759fc38a0a2a9.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/raxeduwibebazurokolajafij.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6040/files/pipokewanosapolubofozover.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/rapikosavituriju.pdf
    • https://cdn.shopify.com/s/files/1/0461/0238/0708/files/dedifufuzekaboba.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7814/files/jigirim.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4506ad533c04849b2b77043daac6fa3.pdf
    • https://static.usrfiles.com/ugd/b8c837_356b15b450b24591b0eb03bcefb11b74.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_off00007742.bin
4870c532ea0ab2dbc7f18c02b8a2253ab91b900a63237ad53f30b7f6b5a1cea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7742 5112 bytes
font_01_sfnt_off00008870.bin
a100a56e14d31eb6b7f0e29769a7be9a24810c4749e96c09254d7401aca8e1c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8870 10796 bytes

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