Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace40120f518d302…

MALICIOUS

PDF

47.0 KB Created: 2020-08-31 06:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f06c0366447e87e383d085534a476de2 SHA-1: a993c350ed7398cb63b976656dabc005292b0389 SHA-256: ace40120f518d302b33d4c230aee737ea6595729c2dbe1a2e5b6fff6e56e29f9
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Burda magazine download free' and the malicious URL. This suggests the document is designed as a lure to redirect users to malicious infrastructure, likely for further exploitation or malware delivery. The ML classifier strongly supports the malicious nature of this PDF.

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=burda+magazine+download+free
    • https://cdn.shopify.com/s/files/1/0434/9476/8802/files/10413091408.pdf
    • https://cdn.shopify.com/s/files/1/0462/0088/1315/files/different_types_of_actuators.pdf
    • https://cdn.shopify.com/s/files/1/0435/5057/2695/files/15831765488.pdf
    • https://static.usrfiles.com/ugd/724bd4_6971bd595062465780e953f32915cc1d.pdf
    • https://static.usrfiles.com/ugd/3f80ec_917aa8896b514d2a919cd2fa7e0c01df.pdf
    • https://static.usrfiles.com/ugd/2f7815_9f7593a849734e2ea575d2d8c45009d4.pdf
    • https://static.usrfiles.com/ugd/6f53d7_a1f759de167c48f1ab81a1ff7dacfc54.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0daee0b5c1b41b2a5fcd330edd29c5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bf50ae1afd24b6fb38718fd7279e402.pdf
    • https://static.usrfiles.com/ugd/3e87bf_c139e9791d0142829380481a1458b705.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec75b9c330194c92a1bd8620845a11a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_20112825a67444488be804422d35c2d6.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/54041225647.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8042/files/zavowigokifinesojukazuser.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
stream_005_off00008761.bin
214b62ecd64c8c1a16589d310c1d9d7acca2dbcb4a7910d3a16ae1026bcd3abf
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8761 22860 bytes
font_00_sfnt_off00005282.bin
f24abd47c2564a3c9d4714d82c71d27ee9bcfdcf6bd90d5a897aba6538fd0474
pdf-font-stream PDF embedded font (sfnt) at offset 0x5282 5240 bytes
font_01_sfnt_off00006458.bin
86b053dd03f7672f861ad75cc771a016e40c32e74b9985d2127a5ab9f0d20847
pdf-font-stream PDF embedded font (sfnt) at offset 0x6458 10160 bytes