Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b84a6e4076cc205…

MALICIOUS

PDF

36.6 KB Created: 2020-07-29 23:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 497b715e993290eb0aa3b18253dec0cc SHA-1: c76e4e0f12d186ee704a64ceefd8f57902300268 SHA-256: 7b84a6e4076cc2050793c4274c5997f72122ed7aba80be0355a182f3cfa0aca9
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through numerous redirects.

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=occupational+health+and+safety+standards+philippines+pdf
    • http://files.hunnicuttscience.com/uploads/1/3/0/8/130813701/saxuvoxesev.pdf
    • http://files.northernfitness.net/uploads/1/3/1/4/131437246/9588946.pdf
    • http://files.seas-marketing.com/uploads/1/3/1/4/131453907/dajevil-jusariv-gudozasafatoxok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/xenatuzunevajumixof.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/falitufatosorokakutotono.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/48016294954.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/kusovuxenodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/15882423681.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/zijumidixizapab.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5030/files/65887068167.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/tufelewapivetoliru.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/39098650631.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/gojubeworurinovimipajeru.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/dolaxapulofozibakigesipo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9062/4158/files/bokifinitujijo.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_off000052d2.bin
af40110a2ffde089ce9677f0bb0299093bd83991aaee04e375c666bf555ef628
pdf-font-stream PDF embedded font (sfnt) at offset 0x52D2 5252 bytes
font_01_sfnt_off000064a6.bin
b755aa4bb186f0390bef9f15c87a8444332ee1131587eb0c8eaf5d0eb85236ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 9432 bytes