Malicious PDF — malware analysis report

Static analysis result for SHA-256 f204bd446bcc4b9c…

MALICIOUS

PDF

43.4 KB Created: 2020-08-23 11:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27222639f76014b6ed7ac9cef67ec117 SHA-1: 209fe57a2ef8ec41cf06bdadd23068282f669e76 SHA-256: f204bd446bcc4b9c72b6088a67e356b19c8c9e3f7572d7d71ec6db6efe9154a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=androidrepublica+playback+error'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary intent is to drive users to malicious infrastructure.

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=androidrepublica+playback+error
    • http://dinapoge.flowersbyflorence.co/uploads/1/3/0/7/130776485/wezegisi_rarapum_revapider_fofidimuzovo.pdf
    • http://files.southamgallery.com/uploads/1/3/2/3/132302963/5468970.pdf
    • https://cdn.shopify.com/s/files/1/0457/5297/5516/files/81038469745.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/45311359719.pdf
    • https://cdn.shopify.com/s/files/1/0435/5548/7905/files/pejenumajekabokamez.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/63118135530.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/kexakowuvak.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/crystal_report_tutorial_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/roland_barthes_death_of_the_author.pdf
    • https://cdn.shopify.com/s/files/1/0432/2512/0927/files/6778396851.pdf
    • https://cdn.shopify.com/s/files/1/0434/2916/7270/files/foxapatujivikupok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/fuxobazezadaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6498/files/28753707754.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/urban_air_pollution_project.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069ef.bin
1d453b054b2628ff95c0a49c53cc9b3f2c45ae9f6fccacb494f121cfe7782a0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x69EF 5184 bytes
font_01_sfnt_off00007b99.bin
98481ee30dc9ca4df6dcee09d5a6c60616f0247f49504efd3334d6d09f3727d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B99 11000 bytes