Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedee728cee1084f…

MALICIOUS

PDF

44.8 KB Created: 2020-07-15 14:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caebc73e67b52f53b703bb6935d2dad4 SHA-1: 0de3653c169ab31897f02b801f4467400d6550ce SHA-256: bedee728cee1084f70b65db0adc84dab3bb712e45cbd2eb794a53729f0eb0bbe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be related to academic content, likely a lure. The primary attack vector involves directing users to malicious sites via these links.

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=simile+vs+metaphor+worksheet+pdf
    • http://files.bohemianbluphotography.com/uploads/1/3/1/3/131379085/gefavobinuraso.pdf
    • http://files.sandifie.com/uploads/1/3/1/8/131858481/61f5a96f.pdf
    • http://files.chrisjsilvaportfolio.com/uploads/1/3/1/4/131453024/fidifutifofute_bubol.pdf
    • http://files.miss-crumbs-a-lot.com/uploads/1/3/0/9/130969712/9bb93060.pdf
    • http://files.kerryrodgers.com/uploads/1/3/0/8/130815213/jipelizite.pdf
    • http://files.miss-crumbs-a-lot.com/uploads/1/3/0/9/1309
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/tikopapuxizira.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2088/files/26234822528.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2817/files/wajepinojokapigonegizame.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/kopupod.pdf
    • https://dazogelin.files.wordpress.com/2020/07/80040200596.pdf
    • https://dupopopuf.files.wordpress.com/2020/06/75728421176.pdf
    • https://vixifujeva.files.wordpress.com/2020/07/22433434908.pdf
    • https://roredixusaji413577688.files.wordpress.com/2020/07/17075040273.pdf
    • https://cdn.shopify.com/s/files/1/0434/2228/5976/files/83067481647.pdf
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/roromefafewurerukajukupi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/deluxelisataku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jegatakufiritejat.pdf
    • https://cdn.shopify.com/s/files/1/0432/4959/8632/files/45175136829.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/36474040788.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/351399324.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_off0000720a.bin
86f59dba138af6b1c8fcb36410da8401e8aa7eb9b788852277cad623b733f276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720A 5280 bytes
font_01_sfnt_off0000840b.bin
5f45fc9ec8a87dfd9e0ffe91ba0cbe13178f1e7ed58e3d516aaccbe576d77b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840B 9912 bytes

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