Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f19d91c1910badf…

MALICIOUS

PDF

35.5 KB Created: 2020-08-14 21:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df5b0a8cda38267ba72cbe470772b218 SHA-1: dbbdc567e691171e9de45974281169332002d6cf SHA-256: 6f19d91c1910badf7a38be87d7ef0d2808cbc40aae11c3c5ca81fe7ae784f203
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URL https://ttraff.cc/pify?keyword=christmas+caller+tunes+free is a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to trick users into downloading further malicious content, likely through a social engineering pretext.

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=christmas+caller+tunes+free
    • http://files.brendanswallace.com/uploads/1/3/1/1/131164052/17b0fbec144aa2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/26218426602.pdf
    • https://cdn.shopify.com/s/files/1/0437/6772/6232/files/neu._annotate_ipad_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/google_maps_driving_distance_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0438/9660/2779/files/john_oens_wolf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0396/0731/files/javascript_array_intersection.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/50490264604.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/sumuwuzikulexekeka.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2245/files/nizinodogi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/61967927617.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_off0000464b.bin
2d936aa63fd32b7abf73087bb0e4165e1e49e5f6c246de81e0c1e4f236bd2803
pdf-font-stream PDF embedded font (sfnt) at offset 0x464B 5024 bytes
font_01_sfnt_off00005737.bin
797e16165c1e3ee7ff88c092fa06353f95e282ecfb700c69474646bb51f38699
pdf-font-stream PDF embedded font (sfnt) at offset 0x5737 13560 bytes