Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b765e822c7b66f6…

MALICIOUS

PDF

64.0 KB Created: 2020-08-09 04:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb9756006ce80e50cdc213a0f0668f48 SHA-1: fade2f3ab065c268101bf00727364d92f2553701 SHA-256: 4b765e822c7b66f64cc83ff3aa2356719210f7f21fc2466f3f24935e5e7e43bc
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to potentially malicious redirectors. The primary malicious link, 'https://ttraff.cc/pify?keyword=3000+common+english+words+with+urdu+meaning+pdf', is designed to lure users into downloading further content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

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/pify?keyword=3000+common+english+words+with+urdu+meaning+pdf
    • http://wixasakez.nanasvoicestudio.com/uploads/1/3/1/0/131070450/f07ea.pdf
    • http://files.soroptimistlondon-on.org/uploads/1/3/1/1/131164556/359564.pdf
    • http://pudidofe.greystonesafety.com/uploads/1/3/1/8/131856543/nefupajilikos.pdf
    • http://files.thisvictorianlife.com/uploads/1/3/2/7/132712676/29528.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/mizuwodo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/94152998193.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6933/files/87245782530.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/68512437038.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7678/files/spatial_data_in_gis.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/el_camino_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8918/2376/files/bamag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/15514352211.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/musedegupepegeduxubewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2130/2935/files/wojugubuwibanejut.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/radapigureromag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lokilus.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2456/files/28972115952.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/
    • https://cdn.shopify.com/s/files/1/0437/6176/2456/files

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000c105.bin
d949562a04e09c98171a013aa82b992f2da8c6131b2cc438c1f0587a05cc9109		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC105 28228 bytes
font_00_sfnt_off00008c00.bin
482779fc4b5bcc73ae345072c3a29c4943716efe68ecbcad9505bf32b5896fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C00 5872 bytes
font_01_sfnt_off00009fe3.bin
2654a6b3d9ad5d7570aee2c1eb628571c5b38b1a98d0bce062a0a4ff8d03bf75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FE3 9652 bytes

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