Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4a987208188e86…

MALICIOUS

PDF

42.9 KB Created: 2020-08-21 21:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e02a477dcba42703d6ca5286c60c19bb SHA-1: ec242ef500f2765e15901d6ab68098fdc77c232e SHA-256: 0c4a987208188e86653039a60c878c9fc446ce3e8c5c222b9a4c57870189a0ad
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body itself contains a URL that is also present in the link farm, suggesting a coordinated effort to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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=baudrillard+simulation+and+simulacra+pdf
    • http://durirolu.northernmichiganlivestock.com/uploads/1/3/1/4/131407552/siwufabefa-nugomena.pdf
    • http://files.hammination.com/uploads/1/3/1/0/131071137/1295226.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6043/6900/files/52413977192.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/wudirezekelekenovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/air_bearing_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/dominion_virginia_power_outage_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13503036424.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/nadosemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2962/files/manaboladinunorek.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/tesejojesesadovuzibeburu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/pamajexupewekopefesutata.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/aminoacidos_esenciales.pdf
    • https://cdn.shopify.com/s/files/1/0430/8094/1721/files/kala_movie_song_starmusiq.pdf
    • https://cdn.shopify.com/s/files/1/0438/2919/9005/files/adway_latest_apk_onhax.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_off00006a35.bin
1d1c01d9689b4954c3b14a10e1d3e5e96f940062690b71d80a228b2ca307a013
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A35 5348 bytes
font_01_sfnt_off00007c44.bin
a1e78bb9f7e2d6f4d6e536bf559b36e8fcd7118069670f75640ec8a9b61d961c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C44 9940 bytes