Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bffb9300306ca55…

MALICIOUS

PDF

55.9 KB Created: 2020-07-31 21:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1785d4dfbe5c9c444fda1be3ef17e75 SHA-1: b6a8aae420770a773c0511e7f1f5f419f7f11f44 SHA-256: 8bffb9300306ca558f74e7cb4d773f5bd0efb61971460619f76b6d95520a8173
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDF files, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=5e+human+variant'. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests an attempt to manipulate search results or distribute further malicious content.

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=5e+human+variant
    • http://files.powernotpity.com/uploads/1/3/2/6/132681824/1886294.pdf
    • http://files.dry4u.com/uploads/1/3/1/6/131637218/xowipisijega.pdf
    • http://files.ambitiousmindsofgreatness.com/uploads/1/3/0/7/130738892/gifulojuxeruzo.pdf
    • http://files.mrcolliard.com/uploads/1/3/1/4/131438449/witakoba_dafiw_xexewina_fakowizekosoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0450/9853/files/jubinunup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/kezadefuniparinonamaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/70388065588.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/26703390392.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6882/files/35773431581.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/55338094984.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8311/files/mibetilufagexadaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/33319702238.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1943/files/nezazolara.pdf
    • https://cdn.shopify.com/s/files/1/0434/4764/8406/files/31263977752.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/vawurirejituxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/fagovupifuvabupod.pdf
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/dorenivi.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_off000092d1.bin
9eb96bc7884766f251c98554297d39aa9825825e7cd3aeb7413ec59e8cedb9e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D1 4576 bytes
font_01_sfnt_off0000a22a.bin
09db70c5e00a16a876fbb91ceec9019d559379febd339d04578703d324c9da5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA22A 10176 bytes
font_02_sfnt_off0000c4e9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E9 4324 bytes

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