Malicious PDF — malware analysis report

Static analysis result for SHA-256 024b747c69ed5acd…

MALICIOUS

PDF

41.9 KB Created: 2020-09-02 00:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ecc3df4bd0cc45c1ef3a16e223fd2e SHA-1: 267007f9af1fe201b60ad17cc4e82e6315873007 SHA-256: 024b747c69ed5acd6c7996ace37be55996b56d70d666943ba165b5ff8134b944
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is used to lure victims. The document body, though heavily obfuscated, contains the same malicious URL and a large number of other URLs, many of which are benign Shopify links, suggesting a link farm or SEO poisoning attempt. 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.com/wix?keyword=champion+bengali+video+song
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4023/4902/files/zemomidedoti.pdf
    • https://cdn.shopify.com/s/files/1/0461/9406/5557/files/que_es_el_botulismo.pdf
    • https://cdn.shopify.com/s/files/1/0446/5931/0745/files/lajisiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/4588/6884/files/algebra_and_number_theory_anna_university_notes.pdf
    • https://static.usrfiles.com/ugd/6e3131_727cb14a974f45e9ba0ab7919116e027.pdf
    • https://static.usrfiles.com/ugd/b8c837_5be4f193f219455d8047db8ff99135ce.pdf
    • https://static.usrfiles.com/ugd/b88e3d_d61c8fad070346f38765b84d727eb67f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c1871b2c111469794a22ba57d7b20d4.pdf
    • https://static.usrfiles.com/ugd/49488e_68d84d46f14a4f7ba253412a9d722d13.pdf
    • https://static.usrfiles.com/ugd/cb2bed_6dd34c5eddb74402bae0c57319903207.pdf
    • https://static.usrfiles.com/ugd/fe0276_7ec2efebced44555a87a51bf514585cc.pdf
    • https://static.usrfiles.com/ugd/44b221_9ede7639cce744a581b6d57d1e1f2298.pdf
    • https://static.usrfiles.com/ugd/87fdc7_e52b2eb9d2e4463dbb5921dafae8c883.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b60954656eb4c149fba766bfe93ab8f.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_a1d1eea50ed4468889fb4267b26ef26f.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005137.bin
7856337785ae6fd964cd51c1522385767ca3cbac236eab32a629b4a3dfb5c386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5137 5380 bytes
font_01_sfnt_off0000635a.bin
bd4765be2cdee16ecaaed00a788dcbc3a4c64df586d90b755f88cdad32800a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635A 10052 bytes
font_02_sfnt_off000085b4.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B4 16164 bytes

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