Malicious PDF — malware analysis report

Static analysis result for SHA-256 2100e78a6ae12b52…

MALICIOUS

PDF

39.5 KB Created: 2020-08-20 04:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 250bd94c111270163491abbb03f4d4e9 SHA-1: 1ae078f4f0db28d6090064a0fca2c675cbce6688 SHA-256: 2100e78a6ae12b5299cde6d57e8a0bc7711848e2577f9ce73d3ee2a0e219c493
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a deed of assignment template. The document body and embedded URLs indicate a link farm strategy, likely intended to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=deed+of+assignment+template+nsw
    • http://files.adenrossinni.com/uploads/1/3/1/6/131606140/batudabolese.pdf
    • http://files.eitanhersh.com/uploads/1/3/1/4/131406841/rukarexug_wufuvire_wifilepuzob.pdf
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/farafowuwezemegoku.pdf
    • https://cdn.shopify.com/s/files/1/0430/2539/9971/files/wedding_dj_contract.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/32722271740.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/84526817286.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/94691835209.pdf
    • https://cdn.shopify.com/s/files/1/0429/5606/2876/files/kogobogikejelisumowula.pdf
    • https://cdn.shopify.com/s/files/1/0438/4315/8166/files/kedumiwova.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/68535492398.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053af.bin
1d32e9cded95a1795fdafc659133684244f7dfda028555183f8b395bf5e11aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53AF 5144 bytes
font_01_sfnt_off00006533.bin
dbef1fc9a2250915957e8aaed4d6aabd0b6ecb368bbfac8899c31895ca824492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6533 8968 bytes
font_02_sfnt_off000083b6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B6 4324 bytes

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