Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f92bff044d030fd…

MALICIOUS

PDF

43.6 KB Created: 2020-08-22 06:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c4e0c8d49712f379e7fe4e9319f66dc SHA-1: 5590bc43376a47d7a883f904df9f8e9510193821 SHA-256: 8f92bff044d030fd9f1c94c4a2a1806000de2348ce7e3b6311ea629b0e468dbe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Contour next ez guide' and includes the malicious URL. The presence of a link farm suggests an attempt to broaden reach and potentially mask the malicious intent. The ML classifier strongly indicates 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=contour+next+ez+guide
    • http://files.hawaiianryanmassage.com/uploads/1/3/1/1/131164185/julixala-nosogut.pdf
    • http://files.evabogdan.ca/uploads/1/3/1/1/131164260/7331543.pdf
    • http://files.catfe.net/uploads/1/3/1/1/131164473/8616a0fd8bae725.pdf
    • http://files.bennettfisher.net/uploads/1/3/1/3/131384115/79d0031b5f917.pdf
    • https://cdn.shopify.com/s/files/1/0430/9339/3557/files/filofupezoxilaxojoruf.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/meteo_cardedu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/handbook_of_qualitative_data_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/wurovaxezi.pdf
    • https://cdn.shopify.com/s/files/1/0461/9567/1203/files/fusopejumova.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/nuxowake.pdf
    • https://cdn.shopify.com/s/files/1/0440/1309/3029/files/27487454283.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gadawatozuwagujezudoru.pdf
    • https://cdn.shopify.com/s/files/1/0438/0105/1293/files/durigegiru.pdf
    • https://cdn.shopify.com/s/files/1/0429/9276/3039/files/rojigiw.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d21.bin
75178880df74ed50254e12aeefeeb6e86c00d247e33624a6da3ca2357ef1520d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D21 4596 bytes
font_01_sfnt_off00007cda.bin
c6f7f9ba63196c4224187345d0ffe8222dfffbe53588e2d40157adafb1153724
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDA 10756 bytes