Malicious PDF — malware analysis report

Static analysis result for SHA-256 824a6af9e99b4730…

MALICIOUS

PDF

63.6 KB Created: 2020-08-19 15:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 261233f1377ea2f3b28e591a4cd702df SHA-1: 8da0fa4ff8b9f8125cac4e0a8e11bb94a4d7369f SHA-256: 824a6af9e99b4730f700e04a7fe981a4d8c8adaab9981b7976622f47ffae8474
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to redirect the user to malicious content, likely as part of a phishing or scam campaign.

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=abc+report+newspaper+circulation
    • http://kinujul.corhartselle.org/uploads/1/3/2/6/132681947/883779.pdf
    • http://files.andreamalinskymason.com/uploads/1/3/0/8/130814284/6058769.pdf
    • http://files.mimiscrafts.com/uploads/1/3/1/4/131406610/ec6742495c08.pdf
    • http://tasep.parksummerprograms.org/uploads/1/3/1/0/131070872/bifagusi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/netosowupibupolimuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1449/6161/files/nuxegawibema.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/cardinal_birdhouse_plans.pdf
    • https://cdn.shopify.com/s/files/1/0432/4871/3896/files/90057166562.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8933/files/37242507051.pdf
    • https://cdn.shopify.com/s/files/1/0435/1164/4324/files/le_calvinisme.pdf
    • https://cdn.shopify.com/s/files/1/0447/5630/4023/files/dd_news_reporter_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0714/files/timer_14_minutes.pdf
    • https://cdn.shopify.com/s/files/1/0436/1263/5299/files/dnd_sorcerer_wild_magic.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85286147205.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_off0000aed9.bin
46e677bd2bd403fbef53dd9946dbf5d3ea24bb6a4bd98c1a593dec41fdd1d655
pdf-font-stream PDF embedded font (sfnt) at offset 0xAED9 5148 bytes
font_01_sfnt_off0000c06d.bin
467555bbddb84b584f2f4fa0d5f240b7b1f38eb5aadb8171b2f767737dacd3e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC06D 16032 bytes