Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bffc16cb2c31406…

MALICIOUS

PDF

68.9 KB Authoring application: Pdftk
MD5: 1ad830a27ac4dd6bb8f5243e1ee9dc29 SHA-1: 1e1e99b8ed4afd9a16b9ef389e2e9f30bb12e90a SHA-256: 8bffc16cb2c314065d23a184fcdcfcc2bb00ccc1202e74be26c9981b039f7cc1
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF files, a technique commonly used for SEO poisoning and distributing malicious content. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to English grammar questions, likely to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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 http://cslsolution.net/uploads/1/3/0/5/130543462/9875376.pdf
    • http://simonepaganelli.com/uploads/1/3/0/6/130622022/7396891.pdf
    • http://portraits.meliraphoto.com/uploads/1/3/0/5/130543364/gijusenomitetikiru.pdf
    • http://wito.itechieguru.com/uploads/2020/01/28/begoj.pdf
    • http://vanishedacres.com/uploads/1/3/0/4/130435633/5f4d657c3ef1c.pdf
    • http://bykatieblack.com/uploads/1/3/0/5/130550848/1563429.pdf
    • https://rafilaluxonijew.weebly.com/uploads/1/3/0/4/130476150/getijemujavu.pdf
    • http://456fillmore.com/uploads/1/3/0/6/130640235/viwuwejulomeped.pdf
    • http://ladaxojof.tuyuy.icu/uploads/2020/01/28/199564.pdf
    • http://kayleighpeddie.com/uploads/1/3/0/5/130588613/130588613.html#hard+english+grammar+questions+and+answers

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012d4.bin
87cb7031576fad1043fdaf1f70302e37ff8fc6942ab4aa93f9ffd651420eaa79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4 9016 bytes
font_01_sfnt_off0000c7eb.bin
5d7ebd720715cd86529581f1d40cc643f68465477bd430d4be5ff736bc95f798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 16268 bytes

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