Malicious PDF — malware analysis report

Static analysis result for SHA-256 7635b8673be21bec…

MALICIOUS

PDF

71.9 KB Created: 2020-08-20 01:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb55f72c8a4b31a97ba578b0f7ceaebb SHA-1: 437c29f9366cb70b2582922da55ddf410350065c SHA-256: 7635b8673be21becda1a499b5d05e4b67699fedbefaef0f68ddd43dba3b78ec9
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. No scripts were extracted, but the primary malicious indicator is the redirector URL.

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=public+policy+making+pdf
    • http://files.midnightriderbrts.org/uploads/1/3/1/4/131453494/fononetif-gokuf-wizoleja.pdf
    • http://divewe.mustafaclub.com/uploads/1/3/1/1/131164462/dalagejasugug-minegunugudavos-dogot-nubit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/68053136380.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/majoworolodoguza.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/jpg_to_online_converter_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0429/files/destination_b2_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2376/files/nagezu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/21_cfr_part_11_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/96617390969.pdf
    • https://cdn.shopify.com/s/files/1/0433/0048/7332/files/99953786315.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/fumaxata.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/zuvekuni.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_off0000dd2d.bin
12fc6d3e9824b127d6a5b657f03514c7536c3e7ca351c0914c6915785e289fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 5508 bytes
font_01_sfnt_off0000efd2.bin
96836628c1247b30cef0ab5b2831d053daa615ea390a0e015a1e3516340d86a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 10284 bytes