Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb03b4bd4f08cc45…

MALICIOUS

PDF

53.7 KB Created: 2020-08-13 20:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1897bad9f91f3f94456f444f9579a988 SHA-1: e2c747e439a5df0b1c9d21834535323381098f8a SHA-256: cb03b4bd4f08cc45fa85e80aee41f1de3e639d83fdcf4389a5ef20f386865759
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a manual for an Indesit washer dryer, but it redirects to a known malicious infrastructure at ttraff.cc. The ML classifier strongly indicated maliciousness, and the PDF structure includes numerous links to external PDFs, likely for SEO manipulation to increase visibility. The primary intent appears to be directing users to malicious content via a deceptive lure.

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.cc/wb?keyword=indesit%20washer%20dryer%20manual%20iwdd7143
    • http://files.intlsimdriversclub.com/uploads/1/3/0/7/130776485/5515734.pdf
    • http://files.southeasterntruckbody.com/uploads/1/3/2/6/132695397/monew-bavupikefo-jedobu-jedazitojubag.pdf
    • http://files.brucealvesiii.com/uploads/1/3/1/3/131384293/gaxotufumotubu-gofoxivugerupu-tipamunate-rebizefisovodaj.pdf
    • http://gulerawo.westlakescampus.com/uploads/1/3/1/6/131607240/5323181.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/dulapafetul.pdf
    • https://cdn.shopify.com/s/files/1/0440/1420/7134/files/sivimilukanodosome.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/audible_app_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8876/3298/files/cahier_de_journal_primaire.pdf
    • https://cdn.shopify.com/s/files/1/0450/0806/0574/files/canetti_masse_und_macht.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/dotikodeti.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/94744081560.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/xipazafunem.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/85649359261.pdf
    • https://cdn.shopify.com/s/files/1/0454/5331/2150/files/63185612176.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/p90x3_nutrition_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/66706048224.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1069/files/furigizowadobometin.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_off000091d8.bin
86be043f8b3cd76ce6b52dd46a4d59306ed55aaf58244326e3e722804a35d78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91D8 5580 bytes
font_01_sfnt_off0000a4ce.bin
2ce3e0a087c120ed8d75d6d06f33d33fe08c94e77c3d57779fe8f8d8f119b777		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CE 11044 bytes

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