Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a21679334a696bb…

MALICIOUS

PDF

43.8 KB Created: 2020-08-06 11:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca0c93f226feff80f0e22b5ef865e433 SHA-1: ccf4e563a3d61da2e7359cdac341f0b71fb28d29 SHA-256: 1a21679334a696bb79e548c1508c96dbe8a51bb126cb5e50c9c0478184424f12
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is part of a link farm designed to lure users with SEO-optimized book download lures. The primary malicious link is https://ttraff.cc/pify?keyword=site+reliability+engineering+book+pdf+download, which likely leads to further malicious content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=site+reliability+engineering+book+pdf+download
    • http://files.facsglobal.com/uploads/1/3/0/7/130775503/1035398.pdf
    • http://files.cherryblossomwellnesssalon.com/uploads/1/3/1/3/131379730/tugikoriz.pdf
    • http://womowimaf.bcmediaphotos.com/uploads/1/3/1/1/131163635/jojor.pdf
    • http://files.rileyortonfoundation.org/uploads/1/3/0/7/130740586/xafozusefise_tesanegatuni.pdf
    • http://files.calmundertension.com/uploads/1/3/1/1/131164272/dejatejunobutenaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fexofedome.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/tepovegunapovajegaputa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/moguboratukadidexax.pdf
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/vusajafowuduf.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/pizalafudewusapusigu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/wivepine.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/30266637170.pdf
    • https://cdn.shopify.com/s/files/1/0437/0841/6165/files/78841590787.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9632/files/pavawuxunedugipejuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/3094/5693/files/bixazewuba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/marvelous_designer_6_tutorial.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_off00006adb.bin
095c613b3b0ba7102e0cf09903338d7283236df031e71df28f68d1dbb7732167
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADB 5532 bytes
font_01_sfnt_off00007dcf.bin
8d45635898a30311835611be8372c7c55bbf8bd6c58693c0c42e0ff45c6fda12
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCF 11292 bytes