Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e73ae547af76bb…

MALICIOUS

PDF

40.3 KB Created: 2020-09-06 09:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 446bd67bb9af2f709b815749630d554c SHA-1: 3972966708b37040a8af0a33d67ca9954b4f7247 SHA-256: 86e73ae547af76bb8c431b238d527d0bb246e29a01e369a88a48bc3d553b44e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a junior field hockey stick size guide. This suggests a phishing or scam attempt to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=junior+field+hockey+stick+size+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6960/2981/files/68446657822.pdf
    • https://cdn.shopify.com/s/files/1/0430/4388/1114/files/tunabixadotelikixoviwuko.pdf
    • https://cdn.shopify.com/s/files/1/0445/5170/0644/files/mizusigusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6738/3713/files/bromatologia_livro.pdf
    • https://static.usrfiles.com/ugd/0a0016_1593e211987d4d7895f614a293ee7579.pdf
    • https://static.usrfiles.com/ugd/9df9d6_22605f416cfd472f9feada2c98fb9203.pdf
    • https://static.usrfiles.com/ugd/b42fd6_c9a00bf0a3e94aa68f0e1e71e76e4be8.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/dufimafelit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7920/3992/files/chegg_solutions_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5176/files/saxid.pdf
    • https://cdn.shopify.com/s/files/1/0432/0981/8272/files/pobupifor.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/90911822377.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/english_to_bangla_dictionary_app_free.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_off00005f9b.bin
6dfcca809ec523a2fbca64b75d34583d102444986d33979abf35ef464b8c262f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 5276 bytes
font_01_sfnt_off00007197.bin
db27d263245b40061f79d8db7c9aa5d67de9074503521dc48dc38db11011f0ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x7197 10264 bytes