Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46a876d363f94b5…

MALICIOUS

PDF

44.5 KB Created: 2020-08-29 13:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19c9af96ee81b3b3889d21101aa62707 SHA-1: e211a99495c1ffbd8da0702e2bd656754eeaa82d SHA-256: d46a876d363f94b57fb59a7d064e406fb001603f859437eb336d566974aa0025
152 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to a search query. The presence of numerous links to external PDFs suggests a link farm or SEO poisoning attempt.

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=star+trek+communicator+sound
    • https://cdn.shopify.com/s/files/1/0431/5283/4717/files/64136844368.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/pee_mak_phra_khanong_full_movie_eng_sub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/81030271245.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/81153151475.pdf
    • https://static.usrfiles.com/ugd/b8c837_425172f5ef1142d281c972b79a3e1579.pdf
    • https://static.usrfiles.com/ugd/accd1f_f744fc765eab4cd2af121bfeb920fd88.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e2ceeff3cc145b5b535b7725b6ce195.pdf
    • https://static.usrfiles.com/ugd/b8c837_8802e6d6dfc24d6abd5ed5a757618d64.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ad2c6d186d241708bee8ee9f35fc233.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ab8d2e2da394f6191214d53b1402e32.pdf
    • https://static.usrfiles.com/ugd/9e41f0_511c820a2ccb40f483f60ef1cc5c3093.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5c2cf93c6d043be8a06f2c6d6083b17.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff482b99a2044902bd9b5e8ca62e7d65.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b76a8d3816d4fdfbe9dcf1633979a1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_62694bd5de174a3cbe575983660a3ff1.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_off00006142.bin
c2c0eb8160378a3a32ec58dbfce15c78e4b6172460e136b32181c0951332a7c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 3852 bytes
font_01_sfnt_off00006d96.bin
a4eceb5b56d63ebb2d0740c04a4fc46d58d8177bf98a537fec2263cf54b8f7c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 5220 bytes
font_02_sfnt_off00007f2f.bin
2ebbbe463558c8b33865c915b77a55369c68495f1361993ef5c5647537883dc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2F 11080 bytes