Malicious PDF — malware analysis report

Static analysis result for SHA-256 623d8d0c131a277d…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 07:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58c9b220b18905417cc00d3f2e2fd895 SHA-1: 24f60b09fb6715ca9045749435d85e8ac51a2aaf SHA-256: 623d8d0c131a277d9ad2e554f977ad83f092919222783aa2e8accc3b3abcb7cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to software downloads, suggesting a lure to trick users into clicking the malicious link. The presence of many external PDF links further indicates a link farm, likely used to distribute malicious content or for SEO manipulation.

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.ru/wix?keyword=gta+5+indir+%25C3%25BCcretsiz+gezginler
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/2425/5898/files/industrial_microbiology_by_casida_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0532/1109/files/rumulinijosivilelaz.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e7e86ad4aed49b9ac40bc4da994814f.pdf
    • https://static.usrfiles.com/ugd/b8c837_452a67ee03204b04ad540fb7f604c35f.pdf
    • https://static.usrfiles.com/ugd/0d002d_8ae4afccf1dc40adb739dd2fe89e0b82.pdf
    • https://static.usrfiles.com/ugd/3fc21f_44b0163bb4ca44b190d2811ee2ca1995.pdf
    • https://static.usrfiles.com/ugd/26938b_ccc3b1b5870c4c39be01d561851513e4.pdf
    • https://static.usrfiles.com/ugd/ee6770_71795daf50104f8f938e3060681cf708.pdf
    • https://static.usrfiles.com/ugd/b8c837_782299235530450c9058303eeaf824af.pdf
    • https://static.usrfiles.com/ugd/41a0b6_92e03343bf5c44c4aceb9c7445742395.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f47abcdb9904945a9c1c2bf44638d6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7807bcadfb849dea0642997cd7616ff.pdf
    • https://static.usrfiles.com/ugd/c0b427_f594477c125e44a6844e9c7ec46f4cb5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006439.bin
a86bf36f4f9dfdea7f0f5939ab411848e7e48f0be87e66dc01266e0c7328a85f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6439 5432 bytes
font_01_sfnt_off00007695.bin
c09b2282affe33c83681764f5ee5c30268f6d1acb6e0d71dd9c51bc28fc36908
pdf-font-stream PDF embedded font (sfnt) at offset 0x7695 15236 bytes