Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b66e1409a079f9…

MALICIOUS

PDF

45.7 KB Created: 2020-08-19 05:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35c15d93ee365752bb205eb4a0844368 SHA-1: a75cbc5b894e62cfa116238e75128c98169562fb SHA-256: 74b66e1409a079f9978f327d688a6fe0e23fe1044cf5457985b2f721d72e8a62
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same malicious redirector. This suggests the primary purpose is to redirect users to potentially harmful content, likely a phishing page or a malware download site. No scripts were extracted, limiting the analysis of specific execution chains.

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=expert+infantry+badge+study+guide
    • http://files.friendsofstandrews.org/uploads/1/3/1/4/131408103/7a04ad1e1680607.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/lifebazinavosovofajaru.pdf
    • https://cdn.shopify.com/s/files/1/0429/2290/1663/files/naruge.pdf
    • https://cdn.shopify.com/s/files/1/0435/4274/1143/files/53582929197.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/braun_fp3020_food_processor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/9108/0869/files/nefolabibaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0824/files/67483131247.pdf
    • https://cdn.shopify.com/s/files/1/0438/0878/4541/files/1811629236.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21883700101.pdf
    • https://cdn.shopify.com/s/files/1/0435/7803/2296/files/sepsis_fisiopatologia_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/bumirunulawelifadosu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/ad_hoc_network_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/3366/3400/files/david_deangelo.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_off000074db.bin
c149b665c2aa8e984eefa41825b6b85447ee90e4c289882952a19bd3c1ffc463
pdf-font-stream PDF embedded font (sfnt) at offset 0x74DB 5444 bytes
font_01_sfnt_off00008775.bin
d69d089f3a4c0517891a7ef061c139a21073c61976e1fdf2cce853ad0aeea622
pdf-font-stream PDF embedded font (sfnt) at offset 0x8775 10192 bytes