Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c16bc715e3b7a95…

MALICIOUS

PDF

48.0 KB Created: 2020-08-02 14:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2850dc953694469c1e243f816cccdff6 SHA-1: afab3156168835f63874849f24217e1a6d907ab2 SHA-256: 0c16bc715e3b7a95f4e409cd221425b2e3b8891e6ebf85a1eb991f4be1b75b5b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the document body and embedded links suggest a lure to malicious infrastructure, potentially for phishing or malware distribution.

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=examples+of+interval+variables
    • http://files.camptowandastore.com/uploads/1/3/1/6/131636995/gutupufopadovobivo.pdf
    • http://files.asantesboutique.com/uploads/1/3/1/1/131163782/topuzodak_jepajepizobiga.pdf
    • http://files.dancewithmestudios.com/uploads/1/3/2/6/132681670/6445590.pdf
    • http://files.kellydumont.com/uploads/1/3/2/7/132740278/mosajukuba_lutab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/stihl_026_parts.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/21582528787.pdf
    • https://cdn.shopify.com/s/files/1/0432/0103/6443/files/developer_mode_chromebook.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/56875389647.pdf
    • https://cdn.shopify.com/s/files/1/0431/6141/9927/files/30555835327.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/55860745140.pdf
    • https://cdn.shopify.com/s/files/1/0431/5414/5444/files/76908695314.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nisej.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7674/files/62671635842.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/9304029980.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4280/files/38739314186.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/fapamoresa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/81197857098.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_off00007790.bin
dac6a79a03e302e250aa333d1304cb6eeddf3d6c2594e6282578b2f172409237
pdf-font-stream PDF embedded font (sfnt) at offset 0x7790 5272 bytes
font_01_sfnt_off0000896e.bin
50c19fb891d4348fd4eea121924ccf414bbdb1527949be7c5061f9b33bd69258
pdf-font-stream PDF embedded font (sfnt) at offset 0x896E 12832 bytes