Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f1b02b7f977919…

MALICIOUS

PDF

49.5 KB Created: 2020-09-02 18:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4dce919d713c08218b435ac9fa254ca SHA-1: bcc4763cfbab9ccacd48e382fd1ac8a69fd2a7d4 SHA-256: 81f1b02b7f977919e581f0368f3909467182fe420b9b39948266c6df0083b6cb
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, appears to contain the malicious URL. The presence of many external PDF links suggests an attempt to manipulate search engine results or distribute content through a link farm. No scripts were extracted, but the PDF structure itself facilitated the malicious redirection.

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=komplikasi+ameloblastoma+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/geo_bee_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0443/8809/0022/files/arpan_picture_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/6415/5560/files/takilobelakeruvedijuf.pdf
    • https://static.usrfiles.com/ugd/9f06f8_0e024adb681b4540ab1ac2a01ab5619a.pdf
    • https://static.usrfiles.com/ugd/314c35_0904312c1bf046c6b247032e4469a76e.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/opm_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1591/files/rawuvekipoget.pdf
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/space_truss_design.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/64301479179.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/susimukaxuzopifasinuxu.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_701d71a0b76e4f458a0f74e959f6857d.pdf
    • https://static.usrfiles.com/ugd/455f95_2ea1ba8094ee4181b988e4d5856b751f.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_off00008438.bin
3f45118a44d94811a337d9fa5ba9a633217f69e14053c6da522ef363150d3a87
pdf-font-stream PDF embedded font (sfnt) at offset 0x8438 5264 bytes
font_01_sfnt_off00009604.bin
6c4ed92924affc4195182fe88d1b72f376cb94c64664bb73f614a924a23cf847
pdf-font-stream PDF embedded font (sfnt) at offset 0x9604 10348 bytes