Malicious PDF — malware analysis report

Static analysis result for SHA-256 8261598b01d0cd4e…

MALICIOUS

PDF

40.6 KB Created: 2020-08-20 23:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1d93730cb5614705252594cc64abac5 SHA-1: 8cbfc0c1367204be85e7ca9b0082c7dfa23ce833 SHA-256: 8261598b01d0cd4e85fc7ca8b74c619f268e35b4ac7afce9c96354eeb1c96c7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a mass of external links, with one identified as a malicious redirector. The primary malicious URL is https://ttraff.ru/pify?keyword=new+testament+bible+tagalog+version+free, which likely serves as a lure or initial stage for further malicious activity. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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=new+testament+bible+tagalog+version+free
    • http://files.indonesianorphanages.org/uploads/1/3/0/7/130739239/jugik.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/55038133008.pdf
    • https://cdn.shopify.com/s/files/1/0444/4828/4839/files/mathematics_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/38300361765.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/genemujetexezazofo.pdf
    • https://cdn.shopify.com/s/files/1/0441/1500/1496/files/ladixedoxekevo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7225/7181/files/93945858909.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54171278856.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/mamovulozixaliwugibifid.pdf
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/92927889364.pdf
    • https://cdn.shopify.com/s/files/1/0445/4963/6255/files/android_radio_developer_options_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/3154/3463/files/95016898127.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_off00005d64.bin
fefdc53bf875044b1e883d0d96c4c438a9a103f1eb6baf7ab8f853434ce1ab6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D64 5348 bytes
font_01_sfnt_off00006f9e.bin
bad4f3d1aed4640433260465f757704458226a05f6b92564c3a6fc9e38934414
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9E 11444 bytes