Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a08bcbd23b07c81…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 09:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7d39c3ea4c271e6575c79dacb9eeb26 SHA-1: b0552805442bc17023acf8ade791daf7d14426d0 SHA-256: 1a08bcbd23b07c8158bfce414236541242709f9fca60bdb376c28469289beab8
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the same URL, suggesting a lure to external malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a link farm.

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/pify?keyword=effects+of+youth+unemployment+pdf
    • http://files.livinglegendsbaseball.com/uploads/1/3/1/3/131380895/5809ec3389c61d0.pdf
    • http://files.shopplumgifts.com/uploads/1/3/2/8/132814343/zamifagebevigaleg.pdf
    • http://files.dalessandroscouting.com/uploads/1/3/1/3/131379113/gavilulejesid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49816413057.pdf
    • https://cdn.shopify.com/s/files/1/0433/5003/2549/files/nazoritebus.pdf
    • https://cdn.shopify.com/s/files/1/0437/8443/7922/files/project_on_social_issues.pdf
    • https://cdn.shopify.com/s/files/1/0437/5638/8510/files/wiwavarisu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2176/2723/files/jurnal_internasional_pendidikan_agama_islam.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8875/files/dopuvepowag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/31015414403.pdf
    • https://cdn.shopify.com/s/files/1/0434/6200/0806/files/nusodilokinikizexagugale.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/devekorajofujo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/ny_times_marinara.pdf
    • https://cdn.shopify.com/s/files/1/0440/6401/4486/files/ua_classes_5e.pdf
    • https://cdn.shopify.com/s/files/1/0435/7485/3793/files/taurus_millennium_45.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/finaf.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_off00006744.bin
5c2ea48a46e789b0c5048e02012c7e0d073ab1194f05e3695814785cec9dfe98
pdf-font-stream PDF embedded font (sfnt) at offset 0x6744 5148 bytes
font_01_sfnt_off000078b8.bin
2f74ed608b2108d88f5c35b32d54b7920fb323c2599daa588bc161941fce9ebc
pdf-font-stream PDF embedded font (sfnt) at offset 0x78B8 10044 bytes