Malicious PDF — malware analysis report

Static analysis result for SHA-256 164a619c14ffb47f…

MALICIOUS

PDF

49.2 KB Created: 2020-09-29 18:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6b0259089cdfa219c216d5438d38c6a SHA-1: 951e912ef9e783da09b3607b26f315a5f5a435a8 SHA-256: 164a619c14ffb47fa4d09fdc2d7d8b190854e54cf44652118aa0df7c907b6d13
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as an admit card download. The embedded URLs and the document body text indicate a phishing attempt to trick users into visiting a malicious site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://gettraff.ru/strik?keyword=bihar+board+10th+admit+card+2020+download+pdf
    • https://site-1036621.mozfiles.com/files/1036621/jakunatepuzoselug.pdf
    • https://site-1036772.mozfiles.com/files/1036772/mukamoturuxotapewepa.pdf
    • https://site-1036750.mozfiles.com/files/1036750/fogelox.pdf
    • https://site-1036871.mozfiles.com/files/1036871/zebelujobeli.pdf
    • http://files.idealworkmicrotopping.co.uk/uploads/1/3/2/6/132683422/5818105.pdf
    • http://files.steviesays.com/uploads/1/3/0/7/130776180/712cce6dd2982fe.pdf
    • http://siloje.marianhomes.org/uploads/1/3/1/4/131406688/4ede1cca36d281d.pdf
    • http://vulaku.theafroronin.com/uploads/1/3/1/3/131383476/367633bc4ac.pdf
    • http://files.louisewknight.com/uploads/1/3/2/8/132815183/724662.pdf
    • http://xidineze.eemorydavis.com/uploads/1/3/1/3/131383775/1286631.pdf
    • http://files.glennorion.com/uploads/1/3/0/8/130874296/971363.pdf
    • http://files.bernhard.co.at/uploads/1/3/1/3/131384589/xozufewetad.pdf
    • http://garudu.multinationalministries.com/uploads/1/3/0/8/130874431/tiduse.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/29a6b95a-4634-4473-a56c-a3b5a6edc636/48249998438.pdf
    • https://uploads.strikinglycdn.com/files/ea316584-de91-4038-8945-d863b245a345/telepe.pdf
    • https://uploads.strikinglycdn.com/files/269ea1f2-8151-438e-b3a1-419284ad603f/dataxavu.pdf
    • https://uploads.strikinglycdn.com/files/02d0e3b7-58c9-460d-b822-04564e4422f5/rovikubumepilu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a10.bin
fcd854a39a94115e471b4d9459da53d0cb60c017730b758f4f636282f48a325e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A10 5824 bytes
font_01_sfnt_off00007dd1.bin
fd1900bbaf3a92a840df97145ba322e8244ce7c6d0aac2773bd2b44358a5e776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD1 10104 bytes
font_02_sfnt_off0000a09f.bin
1d3824dc3839aedd759d1198c9346e0c5888a4da9def95f8de6579e60c845c24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA09F 6576 bytes

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