Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebf20845b27645d…

MALICIOUS

PDF

56.7 KB Created: 2020-07-28 22:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 135eae60bd3dbaf627cfd21c8fd8f35f SHA-1: 33560debd5bc1e45fa2599fdea97c0003cc88151 SHA-256: 4ebf20845b27645d0d593f56190a6b2c9f76e0c85594dea468e4a6856a739724
152 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing a large number of embedded URLs pointing to other PDF files, likely for SEO manipulation or to distribute malicious content. One of the embedded URLs, https://ttraff.cc/wb?keyword=los%20gallinazos%20sin%20plumas%20ribeyro%20pdf, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=los%20gallinazos%20sin%20plumas%20ribeyro%20pdf
    • http://files.thenepeanrowers.com/uploads/1/3/1/6/131606666/f2cf7ed8a88.pdf
    • http://files.apennyworthdesignco.com/uploads/1/3/0/8/130873864/sevasokiseg.pdf
    • http://files.anisawilliams.com/uploads/1/3/0/8/130874250/giluvifibo.pdf
    • http://files.cfbckids.org/uploads/1/3/0/7/130739933/vemegulo_pugax_rawomezitifabiz_ribaxedep.pdf
    • http://files.annemcmillslighting.com/uploads/1/3/0/7/130775800/momujod-kakamepi-narixifopebufi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/kegabobepewosalebapex.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/zevodefovagidi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/fotaxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/18701808502.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4549/files/49795471675.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/numotufonuperixatito.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/masofibefakovotaxugawaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1554/4737/files/61957737137.pdf
    • https://cdn.shopify.com/s/files/1/0432/3321/4621/files/libeti.pdf
    • https://cdn.shopify.com/s/files/1/0440/0293/4942/files/3986709901.pdf
    • https://cdn.shopify.com/s/files/1/0434/9660/3814/files/faveposolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0693/files/92140041036.pdf
    • https://cdn.shopify.com/s/files/1/0432/7974/5192/files/38897021450.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ccb.bin
2eac3ff6b239b238783e31e0a1ba0c9053b240ab8234c992fe25b8171d516752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCB 5396 bytes
font_01_sfnt_off0000af0f.bin
affbefe77dc6972ce433a70790695f491bff102ec9aa5a8e162eabe852d0a207		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0F 11204 bytes

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