Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab153a44bd4a80b2…

MALICIOUS

PDF

34.3 KB Created: 2020-08-30 06:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45474d5ac0d1e97131530cd06dfedc7 SHA-1: d5ba4c00f36963e1a14341d8024f234f34cc9517 SHA-256: ab153a44bd4a80b272c814209a4a900902500e3d636c9590fc44d2b881bd2c38
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=paroles+aimer+c+est+tout+donner'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document body contains obfuscated text and the malicious URL.

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.com/wix?keyword=paroles+aimer+c+est+tout+donner
    • https://static.usrfiles.com/ugd/b8c837_fbd1a2af1ae94595991240fcbf6f8176.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f4329fbca514f19b89026caab24482f.pdf
    • https://static.usrfiles.com/ugd/8e1900_ddcc8fe7448a4b4797870988e97c7ab8.pdf
    • https://static.usrfiles.com/ugd/5899d5_af9318c8b70a405598185ae903d3ad6e.pdf
    • https://static.usrfiles.com/ugd/67e251_3ca64a3d99364d6a9695aa93dd719a42.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/poulan_weed_eater.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9563/files/the_others_full_movie_download_in_hindi_720p.pdf
    • https://cdn.shopify.com/s/files/1/0431/6774/4160/files/rifezopozap.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/poduxopuvufixolup.pdf
    • https://static.usrfiles.com/ugd/b8c837_81e8c549e290426da2139fed73d8dbea.pdf
    • https://static.usrfiles.com/ugd/7ff653_ec0b89b1e9834fc284fe90ac9b969d7d.pdf
    • https://static.usrfiles.com/ugd/432b07_5cd80702dd484381b1b5e72e63cc6222.pdf
    • https://static.usrfiles.com/ugd/3aee12_36d5f8b1cea646f180bf1f34ab248aee.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_off000047ae.bin
391f481185d13c5de41ef7cd1dfc5831516458f8fe697525408d5e9d21ec78e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x47AE 5084 bytes
font_01_sfnt_off000058dd.bin
85dd0acf2b5e69e5fd12ed306c625f609f419aa1360c8e3ae6d2362c1243c60b
pdf-font-stream PDF embedded font (sfnt) at offset 0x58DD 10640 bytes