Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6d0b2dff888aaf…

MALICIOUS

PDF

33.0 KB Created: 2020-10-30 20:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a51742d1d6cfb25cc46cc3cf1a328ef9 SHA-1: 1c978aa9f75345f6f06ffc8c49e4b2e5b72c6899 SHA-256: 3f6d0b2dff888aafeef6b922648276a9d405f9e113f20ba6bb88cfff5851b5ec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, suggesting an intent to direct users to potentially harmful external sites. The presence of a link farm heuristic further supports the malicious intent of distributing links.

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=brandeis+high+school+colors
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/lukimibopalobide.pdf
    • https://satijezusadevu.weebly.com/uploads/1/3/4/3/134310115/740332a3be.pdf
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/lapigiforis.pdf
    • https://gefelamanak.weebly.com/uploads/1/3/4/3/134353999/xeladisaxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wonoti/chadic_languages.pdf
    • https://cdn.shopify.com/s/files/1/0491/5586/6823/files/teori_idealisme_dalam_hubungan_internasional.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/19225125451.pdf
    • https://cdn.shopify.com/s/files/1/0434/2739/7797/files/temple_run_oz_hacked_apk.pdf
    • https://s3.amazonaws.com/besafefaf/dream_girlfriend_hack.pdf
    • https://cdn.shopify.com/s/files/1/0268/8077/0237/files/jutuwa.pdf
    • https://s3.amazonaws.com/daraniwekamidir/49877051247.pdf
    • https://cdn.shopify.com/s/files/1/0479/1359/9143/files/61736171039.pdf
    • https://s3.amazonaws.com/dukexajuj/rodozesaro.pdf
    • https://uploads.strikinglycdn.com/files/878822d8-ab9f-46ba-ab08-f37562e21a77/nagodefobof.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_off00004473.bin
8134cf089589983725da2257a318d0b399320e10d37333142c831276f391135a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4473 5252 bytes
font_01_sfnt_off00005647.bin
41fd31ea2c051ecfd37cd97b9b371d4b98036bb97b63477612f0f0fa23447c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x5647 9652 bytes