Malicious PDF — malware analysis report

Static analysis result for SHA-256 733729ddf77094ba…

MALICIOUS

PDF

41.3 KB Created: 2020-08-02 19:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e44af4fda3ebc12314ce1865835328c7 SHA-1: 4c0311b1420f5e6b718dd805b4f17103457a2a20 SHA-256: 733729ddf77094bae3ba7eb3e021e4141e282783c94d9b6d85156144d4b4463b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious content. The document body, though obfuscated, contains the same lure text and URLs as found in the heuristics, indicating an attempt to trick the user into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

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=advance+map+download
    • http://files.arizonaclay.net/uploads/1/3/1/3/131383727/8f62fc4b6e.pdf
    • http://files.carlyberg.com/uploads/1/3/0/9/130969080/jomusa-rapijimonemugud-mozovorap-sunogijip.pdf
    • http://jawij.bexleynas.co.uk/uploads/1/3/0/7/130775403/14d44b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/38630532603.pdf
    • https://cdn.shopify.com/s/files/1/0435/8687/9651/files/zogonum.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/monasejifunerojerivem.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/fojemaxurafinalegut.pdf
    • https://cdn.shopify.com/s/files/1/0436/8341/4169/files/duzegatiluvujuxatojowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77603652905.pdf
    • https://cdn.shopify.com/s/files/1/0434/0996/5212/files/lezezuzir.pdf
    • https://cdn.shopify.com/s/files/1/0440/5365/9798/files/38567996710.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/tagitulasigoxonajizunak.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/nebotibosow.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/tuditevogadovezanunetifu.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_off00006464.bin
d370ae8a1d4d2644ef4274008c70ee5ca9579249a3e9de23fbf27ad5b2ca6209
pdf-font-stream PDF embedded font (sfnt) at offset 0x6464 5088 bytes
font_01_sfnt_off000075b5.bin
1c15699dadcab0b3f0bf2cfbec74ee84822e50d9b1c652e2d3ba54092666e011
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B5 10272 bytes