Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aba7300f3eafbf…

MALICIOUS

PDF

42.9 KB Created: 2020-09-05 04:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44e0c2ed9e26dfef4aeabce443a7e587 SHA-1: 5901012c93be3d94fbb542c7661c7f46234b02a9 SHA-256: 70aba7300f3eafbfd8bb7df21afe3de15a64ac87e0a3df20ed81240e582b1e4c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to shopify.com, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to a game. The ML classifier strongly indicates maliciousness, supporting the presence of a malicious redirector.

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=mega+bomberman++for+pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/67417777417.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5055/files/nodup.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/bigutifakajigixalufoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/16539138376.pdf
    • https://static.usrfiles.com/ugd/23e9be_dd7466fbf09a41f78f458a6bca807b31.pdf
    • https://static.usrfiles.com/ugd/03dcd4_555c256a74d04f40bc16ea99b74a8283.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_f4f76e80d3b4436e9aa833cd99eee55e.pdf
    • https://static.usrfiles.com/ugd/55f640_f7bb0fcc5ade468fad859c0abf027b09.pdf
    • https://static.usrfiles.com/ugd/6812d7_fa4508e7cdd944428c81d018b7799d5b.pdf
    • https://static.usrfiles.com/ugd/cb4a18_126a16c8e7c34321a46e5e96b00b7aff.pdf
    • https://static.usrfiles.com/ugd/ea2f88_9cb5a4bdfff649e8a1ecc8c28c8c1eb1.pdf
    • https://static.usrfiles.com/ugd/2f7815_b3d9bfaa114d443c805087b755d46dd8.pdf
    • https://static.usrfiles.com/ugd/b8c837_541235bc2e6e40709379b70d1a5425ae.pdf
    • https://static.usrfiles.com/ugd/3fc21f_dc336c543d5e42eaabf30b6071f31acf.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_0d9d6041042646a2a1c64b61e6f07941.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d8d.bin
d79ffafbf18936cfdeec585f285900bd1db1ccfffe7ca8e220afa97d16482c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8D 4932 bytes
font_01_sfnt_off00006e33.bin
04aa0d03bbe9e1c9d8932b4522b4ba1161155d5091b0f01f3db6db6a1514caa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E33 10056 bytes
font_02_sfnt_off00009060.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9060 4324 bytes

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