Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d72a91c4d2307b4…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 16:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d69d6a60074e69de31b3d141dea80192 SHA-1: 2859fe66a63d579f0c739509130d94d072f202c7 SHA-256: 9d72a91c4d2307b45c80244cffd9dc153e77d0e082f37317a465825d0a48141e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=blokus+duo+rules+pdf'. This indicates the document is designed to lure users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=blokus+duo+rules+pdf
    • http://xuxivevoz.petersburgchurchofchrist.org/uploads/1/3/0/8/130873995/8154353.pdf
    • http://files.literacytakesflight.com/uploads/1/3/1/4/131409498/03c0cf.pdf
    • http://files.maison-lamartine.com/uploads/1/3/1/1/131164063/vugoxotode.pdf
    • http://files.bahamasteachercadets.com/uploads/1/3/1/8/131856430/jitulad_lones_xeviboroveri.pdf
    • http://files.greggrussellstudio.com/uploads/1/3/1/3/131397946/4291069.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/8181583624.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/692878845.pdf
    • https://cdn.shopify.com/s/files/1/0432/7263/4533/files/la_cantatrice_calva_ionesco.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/72822541206.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/38578058125.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/embryo_development_in_plants.pdf
    • https://cdn.shopify.com/s/files/1/0439/2484/8795/files/dexugikasinotakufo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6893/8647/files/fumipixabajuwazipepazazu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6285/files/64863062952.pdf
    • https://cdn.shopify.com/s/files/1/0431/2340/9057/files/computer_all_full_form_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/navomelevolurevudapisewax.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/small_convert_to_ppt.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_off00005fec.bin
66267c1a3bccfa626041d0d3373c1f34d10b85f4b433eb3b6ae27a54e37f6eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEC 4584 bytes
font_01_sfnt_off00006f99.bin
a0d6b8f63b6c21598deec72e957d51cf92293f5e7c0d1c1a1f522fc5cd7247ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F99 10260 bytes
font_02_sfnt_off000092c5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92C5 4324 bytes

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