Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d053c4b7349834…

MALICIOUS

PDF

48.9 KB Created: 2020-08-20 05:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d84f0a2cfb8eaa0f3a575af4bbef739 SHA-1: abf611bbd5c236518bcc029e7c582fe6049d9151 SHA-256: 50d053c4b73498340acaeff48425b1466728bfe446dc26e5afcb306aee5a20b0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=alto+k10+automatic+manual+transmission'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of embedded links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=alto+k10+automatic+manual+transmission
    • http://files.chaskacusco.org/uploads/1/3/1/3/131398530/nafujisifugepigotisi.pdf
    • http://waxese.kristinhardydesign.com/uploads/1/3/2/8/132814930/wumero-guzis-ferifor.pdf
    • http://files.jiffyouth.org/uploads/1/3/0/7/130775974/62cf5ed31f.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/62686473050.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/29809531656.pdf
    • https://cdn.shopify.com/s/files/1/0430/5161/4359/files/16425977272.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/antiretroviral_drugs_classification.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/25289594281.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/17886669417.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/brunei_embassy_visa_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3250/files/sqlite_insert_android_example.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0229/files/notepad_replace_with_new_line.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/tobovimenusamopuget.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_off000076d6.bin
d1adc9d8c87a98dcb44595a0fe3afce81da3ea9629232e1fc01e8183cd1f90c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x76D6 5192 bytes
font_01_sfnt_off00008860.bin
e84ba0127c773a3281e7926c06b93925d5a53ad6b31799807593e4f521820f04
pdf-font-stream PDF embedded font (sfnt) at offset 0x8860 14840 bytes