Malicious PDF — malware analysis report

Static analysis result for SHA-256 16595ef467c7a799…

MALICIOUS

PDF

57.1 KB Created: 2020-08-29 05:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a83f2310564eb12e5b640e8cf8be79c9 SHA-1: 6c455be73823e4bc4074567de8c859fcb058463f SHA-256: 16595ef467c7a7996c401210f1fabf3714c3192560fdd4cd4be1300f165109d3
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic, likely intended to drive traffic to malicious sites.

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=dog+eat+cherry
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_57273fd563a349439d9a31446fe116f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_45c30c6ee8034738b1259254db7c5863.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5a42b1e2bd64bd5809fbedd7ab6d539.pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0629/files/73614563552.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/similar_shapes_area_and_volume.pdf
    • https://cdn.shopify.com/s/files/1/0432/0408/3869/files/holy_bible_in_english_audio_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/losusosa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4659/0872/files/xitebajasavu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6710/files/assault_cube_linux.pdf
    • https://cdn.shopify.com/s/files/1/0428/0261/0335/files/xekumikulitorigutijuroviz.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce275719b69a459aba55253b1fe4c873.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9f555f6009e4528b728fa103a567462.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebf02657339b4e02872284978779b162.pdf
    • https://static.usrfiles.com/ugd/b8c837_73340e03bf734e0db3ff44b49dbedbd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a475f94e48a84b02a5d32bcc93e4a0d2.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_off0000a320.bin
00d923b0124ba7db7f05881e9f6d3cc9bc6fb4a6a7f68376920700de1bea98a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA320 4952 bytes
font_01_sfnt_off0000b401.bin
d1cdf4a24c55ed5f8893d6a6873e6d394e5c9c4efbdf0e4d734469542b5b650b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB401 10424 bytes