Malicious PDF — malware analysis report

Static analysis result for SHA-256 6875f482065ce8ea…

MALICIOUS

PDF

40.5 KB Created: 2020-08-15 01:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a3c3885c0509d8d10c3fb4809f560ee SHA-1: 242434b0dbeb92efe8d2034132d929daeb53b7d5 SHA-256: 6875f482065ce8ea14bf713e70bac602d0a436e2b5cc8da47e10ecc93197b5e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to "bead loom patterns pdf" and the malicious URL, suggesting a lure to a phishing or malware distribution site. 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=bead+loom+patterns+pdf
    • http://vemirivo.synchroski.org/uploads/1/3/1/4/131406082/9690ce84e7e087.pdf
    • http://files.lowlyfeslum.com/uploads/1/3/0/7/130775837/4277768.pdf
    • http://files.nicollaslittleshop.com/uploads/1/3/0/7/130775712/dilinogebepadi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/library_catalogue_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/56221843250.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/430113254.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4730/files/sukanogojakusadugalojo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9213/files/gutubedizodomononefap.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/73218040275.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/types_of_unconformities_in_rock_layers.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/93092421241.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5108/files/energia_geotermica_vantagens_e_desvantagens.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/isotopes_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/supipigemiseperawugol.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/banking_and_finance_course_outline.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/kisibavoxulilebaxup.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_off000061c5.bin
67ee065ef9d2c8379b055e63c780d679c99c7c4a2000349e856a3b03ec13df9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C5 5236 bytes
font_01_sfnt_off0000737c.bin
d241c3a730f7a8a3ea775d19f3c8613298404197dcbfd63de3106aa5c40cbefb
pdf-font-stream PDF embedded font (sfnt) at offset 0x737C 9888 bytes