Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe3e31f9193eec1…

MALICIOUS

PDF

49.0 KB Created: 2020-08-29 21:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09303b2da8207d4a93f8131f7421f269 SHA-1: f8e9cf4ecd47737b6419cf1f9d35fa7595f9cc27 SHA-256: 4fe3e31f9193eec14d7fcde2082344ae1c8364b0a3e973ba59275e083637fe36
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of external links, a technique often used for SEO poisoning or to distribute malicious content. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=halua+song+odia', is identified as a known malicious redirector. The document body contains garbled text along with several URLs, reinforcing the link-farming and redirection attack pattern.

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/wix?keyword=halua+song+odia
    • https://static.usrfiles.com/ugd/b8c837_574a705aa07d4f799105fe34f2ab17ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_d14c48d4c1664a3da4a58274d6d36e87.pdf
    • https://static.usrfiles.com/ugd/d162e3_277b039ea9b04ba984d28bae48a56587.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf983a6072bc472299123ea11dcf430b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b7ea52f661440188443e6796643502e.pdf
    • https://static.usrfiles.com/ugd/b8c837_60aaf34d57d44d2e8efb5eab3e0cbb27.pdf
    • https://static.usrfiles.com/ugd/b8c837_868d8264d78d4aec8feb2fc91f93e382.pdf
    • https://cdn.shopify.com/s/files/1/0439/3841/4760/files/lumejafeza.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1097/files/39787709435.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/how_to_lubricate_a_proform_elliptical.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2652/files/powerpoint_custom_templates_location.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/word_art_generator.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e91.bin
9b3b1ae3b12bda11df607f0399539bd7309b357066064a93fdf3b105d6f06779
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E91 4856 bytes
font_01_sfnt_off00006f22.bin
b9f4005e804c8d934c2b223aeef48a59bf717a27de99941178c002409c183328
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F22 15676 bytes
font_02_sfnt_off0000a0a5.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A5 16204 bytes