Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c301e43ae44872…

MALICIOUS

PDF

39.4 KB Created: 2020-08-12 14:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da41a76618df9e644a03376cb58cdb80 SHA-1: 97855206019158aaf9ddc365d0542f9d8e982694 SHA-256: 21c301e43ae448727551e74dbc91ffd17bba5db61d6bcb09bfecb4cc54820a6c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used in SEO link farms to manipulate search engine rankings. One of these links, 'https://ttraff.cc/pify?keyword=apatia+definicion+pdf', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

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=apatia+definicion+pdf
    • http://files.altitude3330.com/uploads/1/3/1/4/131407135/wosagu-misejus-xowib-nogob.pdf
    • http://tanutopib.kenplattlaw.net/uploads/1/3/1/3/131380390/mupisopozad.pdf
    • http://files.365transportation.com/uploads/1/3/1/4/131406520/9a3a9d816f7e.pdf
    • http://gewazur.crittersitterjc.com/uploads/1/3/0/9/130969959/lafag-xowujadupusozoj-piwadibesagituv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1188956193.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9347/files/albert_bandura_social_learning_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0250/files/93124450010.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/analytical_mechanics_of_space_systems_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7974/5192/files/3478121375.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/74373423216.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/tipos_de_ansiedad_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0433/9885/6867/files/2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/36735456915.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_off00005bf5.bin
0ae4623ce6e7fcbd5eb4a6987b2853a580d2b2a8a5248fad63bafb36f74f3df8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF5 4832 bytes
font_01_sfnt_off00006c73.bin
7cfbaadfb53c1b65e3c463b0010f8117cc2d9d12d1c5e9a46d0251f25283f747
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C73 11020 bytes