Malicious PDF — malware analysis report

Static analysis result for SHA-256 8790850bbd15401c…

MALICIOUS

PDF

40.6 KB Created: 2020-08-02 14:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99aef11d7d176f65fbb82bf265f3d0ce SHA-1: 106d2b6362e98a7666cf4036929159cecfa3df9c SHA-256: 8790850bbd15401c2135970ffe7f5f51fa60e4d998ec9696a736e3de557c3c3b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with a critical heuristic firing indicating it's a link farm pointing to a malicious redirector. The primary URL identified, https://ttraff.cc/pify?keyword=freesocial2011+label%253A+000, is likely used to obscure the ultimate malicious destination. The presence of numerous PDF links suggests an attempt to manipulate search engine results or distribute further malicious content.

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/pify?keyword=freesocial2011+label%253A+000
    • http://files.lesprihaitimission.com/uploads/1/3/1/8/131856627/nokuxerago-fawuwo.pdf
    • http://files.intuitivepetcare.com/uploads/1/3/1/6/131637635/6664186.pdf
    • http://files.musictomymind.com/uploads/1/3/2/6/132681969/6cc7e8ec553.pdf
    • http://files.studyaimusa.org/uploads/1/3/0/8/130874477/vitupuje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/56927850159.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/71878052169.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/14174913318.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/zasidazerenazo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/xijeridotazizuvix.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/tulisaji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/74047007286.pdf
    • https://cdn.shopify.com/s/files/1/0433/8214/5182/files/descargar_kmspico_para_office_2016_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/3103/6053/files/63911849188.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2556/files/29420381839.pdf
    • https://cdn.shopify.com/s/files/1/0434/3208/3612/files/naui_scuba_diver_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/6167065578.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_off00005fa4.bin
1cb837c88bd3302c9915588eeea7047bb77be3d4d65208ac883bc4eb5652e40a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA4 5264 bytes
font_01_sfnt_off00007197.bin
0b26d19e43c51d59dad308c7587b3a426afe075ede11221d93185725ac0d1069
pdf-font-stream PDF embedded font (sfnt) at offset 0x7197 10572 bytes