Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afd28598e9224e7…

MALICIOUS

PDF

70.4 KB Created: 2020-08-04 09:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1934299841b5500f130f19d195e0efb SHA-1: a226a28604513cc34ae7401072552625174d8c51 SHA-256: 8afd28598e9224e7402fdc098513bc4719c073619dbe202564287186747b9454
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many pointing to Shopify domains, suggesting an attempt to manipulate search engine results or distribute content. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru'. The ML classifier strongly flagged this PDF as malicious. The document body contains metadata related to PDF generation and a URL that appears to be part of the link farm.

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=vtu+electronics+and+communication+engineering+syllabus+pdf
    • http://files.cnmiu14nt.org/uploads/1/3/2/3/132303009/fitupi_zalejotaguf_wepixo_memavoxutozil.pdf
    • http://files.josephbrowne.net/uploads/1/3/2/6/132681826/8658942.pdf
    • http://wesepixog.larryhowlettcpa.com/uploads/1/3/1/3/131378780/dirisuguxipuki.pdf
    • http://files.guyingram.com/uploads/1/3/2/6/132681596/3295852.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/24614902761.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/miwuzomuku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupesoxozuwimufuvijolus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/75953032472.pdf
    • https://cdn.shopify.com/s/files/1/0435/9304/0029/files/gedukov.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/71674503235.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/somenomorew.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/xidusorogozudowazivuki.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/woweluwitasoligekazunuge.pdf
    • https://cdn.shopify.com/s/files/1/0432/3521/3467/files/61303096460.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/new_vegas_unofficial_patch_plus.pdf
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/77161053854.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/78751589058.pdf
    • https://cdn.shopify.com/s/files/1/0428/2017/3983/files/wizepugus.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_off0000d4ae.bin
dc43d2519dd92fc321a5d438b0db768b7ce909e6582044eb996117ad9044a74a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 5684 bytes
font_01_sfnt_off0000e7f4.bin
f9cf1296149ae2350553ba113218693b4752333eea9a1acfdd7b3be77b848b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 10532 bytes

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