Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd2d4f405ed2e89…

MALICIOUS

PDF

45.1 KB Created: 2020-10-31 00:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 813f9736d34a04f5174486a2706e4bf4 SHA-1: 1bd13a120fd035feef6de63a21ae8a4140020fbb SHA-256: 6fd2d4f405ed2e89b2ac34079eae5d039b0aed27afd406169ccfae6fb8e15b65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL points to a known malicious redirector, and the document body itself contains multiple URLs, suggesting an attempt to drive traffic to malicious or SEO-manipulated sites. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious intent to redirect users.

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.club/123?keyword=all+my+sons+questions+and+answers+pdf
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/sigojidij_xuloji_barogaw.pdf
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5f8d27196398a.pdf
    • https://cdn-cms.f-static.net/uploads/4376362/normal_5f8e1bab9c2b0.pdf
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5f909c783eda4.pdf
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f870b31e8f78.pdf
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/senesanafis-gupukasotere-melusebi.pdf
    • https://keziripar.weebly.com/uploads/1/3/4/5/134522929/7eaec35708.pdf
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/vugerosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5a0430c7-4cc4-4039-bce6-84fcb5149430/theory_and_practice_of_group_psychot.pdf
    • https://uploads.strikinglycdn.com/files/125fca7a-fba0-4778-a3b8-fa5314375aaa/xevifilimux.pdf
    • https://s3.amazonaws.com/vasofirida/canciones_de_cuna_letra_cortas.pdf
    • https://s3.amazonaws.com/salosibejodod/ariens_624e_service_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007063.bin
3d1957fd1d47c2442b20863e65d87cda0a76b9a5f80e9e0b3e6d9ba223b0101e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7063 5496 bytes
font_01_sfnt_off00008314.bin
cd2c046bed7b59bd8d10c34fe9203fa0e629990da3748c650e070a3eb1e38ab4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8314 10744 bytes