Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6edae43ba1f059…

MALICIOUS

PDF

46.5 KB Created: 2020-08-30 06:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c903ada8d2920f4ec80a021c43cb5a0d SHA-1: 74e7b61cca5489c07dffcd8945e3fc9a1bcbb5ec SHA-256: 1c6edae43ba1f059f52385b89ccbdae15e5fc5c9ba7be07a878982f9039ff421
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external links, characteristic of an SEO link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

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=de+escala-evaluaci%25C3%25B3n+de+codo+de+teni
    • https://static.usrfiles.com/ugd/9904c2_d0071f77e0e64d82a7e3e7ff48f16cff.pdf
    • https://static.usrfiles.com/ugd/7598fa_1b6354e05b7e4d189a6a6b13ffe8e830.pdf
    • https://static.usrfiles.com/ugd/b8c837_269a0ae271c24819a837d7c986639da6.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/89068822512.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/lebuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/0802/2938/files/wamuguw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/82208704258.pdf
    • https://static.usrfiles.com/ugd/e4a001_46258a2948c04c7cae4158122ab1af39.pdf
    • https://static.usrfiles.com/ugd/8cbfce_799494100fe84c54a1b743611a7ba762.pdf
    • https://static.usrfiles.com/ugd/3e87bf_4eca4f72c8b4452e9226e50645cb0fa8.pdf
    • https://static.usrfiles.com/ugd/868401_de099b17585b40208ea3cadaf3a8420a.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd080db55ec54f028f44cb67d5a5092d.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_off00007369.bin
cdfe21658e5d60c4448d1683fb78aaf0f4c438715f8173a82f638ac6683fda84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7369 5064 bytes
font_01_sfnt_off0000847d.bin
8a49bf56eab9074e0a49aeabe90a004a95b460af3df93b4de308167eca4bfe7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x847D 11756 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.