Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b91e0836911cd63…

MALICIOUS

PDF

72.9 KB Created: 2020-08-07 02:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de77c3b1cec0e011736b2ad8cfb4ce9b SHA-1: a03e2fff17a9ede3fb43bd63dc96f44e45c3a8bc SHA-256: 4b91e0836911cd63377f72b1bfe2005216ab19cd5bdba7d01ebd426102aca44e
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=development+economics+pdf+debraj+ray', suggesting a lure to a malicious site disguised as a document. The presence of a link farm further indicates malicious intent to distribute malicious content.

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/pify?keyword=development+economics+pdf+debraj+ray
    • http://gugexuj.1point21photobooth.com/uploads/1/3/0/8/130874493/3851339.pdf
    • http://files.storyatradingco.com/uploads/1/3/1/6/131606027/fukujawol-xogejuto-wepewinemafuk-razulubijolape.pdf
    • http://files.flatheadlakemassage18.com/uploads/1/3/0/7/130739112/7363182.pdf
    • http://files.crowandlilac.com/uploads/1/3/1/8/131871902/6581105.pdf
    • http://bumulivar.leatherworksfordogs.com/uploads/1/3/0/8/130874207/e8686ba5a9.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/lumoravarijafasalovizo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/basatalewepeleniwaxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55166802931.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/toshiba_projector_television.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/dupos.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/marriott_brand_standards.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/fiton.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7067/files/64115453673.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/6523259074.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9097/files/7745580855.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000eaff.bin
2e505c0b937c1d69ba9de74cd0e01d04edb25f5f8d0882beb90232b1f9ef42a3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEAFF 18580 bytes
font_00_sfnt_off0000b562.bin
60a118f9dd8432771e75084cca0b8bafa61ef99184528657a4f5bdeb3c2684e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB562 5464 bytes
font_01_sfnt_off0000c7ec.bin
1558c5750e4eac719637ac02ec7dfc272474cb6168bc3125d34288f4b7807ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EC 10236 bytes
font_03_sfnt_off000107c6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 4324 bytes

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