Malicious PDF — malware analysis report

Static analysis result for SHA-256 5005f3d7d6761abe…

MALICIOUS

PDF

58.7 KB Created: 2020-07-17 18:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e540e2e71ba16b1d41ab7d8f2aec4beb SHA-1: 78c75d671ee7848d96de0e8b3f158d7dc014e5b3 SHA-256: 5005f3d7d6761abe514386667b2c1abe2ad6809386c935117286556d4b2b2344
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a PDF link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wb?keyword=optimisme%20dengan%20kebahagiaan%20pdf'. Another critical heuristic detected a PDF link farm with 30 external PDF links, many pointing to domains structured for SEO. The presence of these link farms and the malicious redirector suggests the document is part of a campaign to drive traffic to potentially harmful sites or to manipulate search engine results.

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.ru/wb?keyword=optimisme%20dengan%20kebahagiaan%20pdf
    • http://files.silverwordsmith.com/uploads/1/3/2/6/132681771/zewafuwur.pdf
    • http://files.brentridgecommunity.com/uploads/1/3/1/8/131871704/revuliwituvo.pdf
    • http://files.tracado.uk/uploads/1/3/0/8/130874510/5b3f3e6e9c769b.pdf
    • http://files.cauchonphoto.com/uploads/1/3/2/7/132710491/4199281.pdf
    • http://files.siliconeallie.com/uploads/1/3/1/3/131380889/wiluwubeforad.pdf
    • http://files.beechwoodtollers.com/uploads/1/3/0/8/130814355/fd575b865.pdf
    • http://files.luisriverapercussion.com/uploads/1/3/2/8/132815753/7251730.pdf
    • http://files.worldofhello.org/uploads/1/3/0/7/130738501/xefexexujazi.pdf
    • http://files.rumpelyarn.square.site/uploads/1/3/1/4/131437079/ad235cca949.pdf
    • https://zazigizer.files.wordpress.com/2020/06/62915763579.pdf
    • https://lojakufobako.files.wordpress.com/2020/07/wumoxuwixilamikoretag.pdf
    • https://bavewugu.files.wordpress.com/2020/07/golikesolezefelutenukuza.pdf
    • https://xozugawaxam.files.wordpress.com/2020/07/galogukubofuverozaxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/mulamoforurubezanozoviro.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2554/files/73160209532.pdf
    • https://cdn.shopify.com/s/files/1/0431/6400/8610/files/11513526099.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/xupadopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/jolimuperejutewuwines.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/vuxofuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/40304594891.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://files.rumpelyarn.square.site/uploads/1/3/1/4/131437079/ad235cca94

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a9b1.bin
43aeeaf1c8503ea687272513ef3eab54bfbac1109e27981a80193dcd2d3a16f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B1 5236 bytes
font_01_sfnt_off0000bb53.bin
457a8c07ef10f31a53571912b0cbbd1a93ad735b490fe54b87dabc5f1069481c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB53 9924 bytes

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