Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63e0f91cb77d12d…

MALICIOUS

PDF

44.7 KB Created: 2020-08-10 12:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3cc0319fbb4beac2adfba666a52891c SHA-1: b2b2d71b3cf7cf3ad0e42b613df6ecb247303c66 SHA-256: b63e0f91cb77d12debc5a988c6d76eacce7cfa36fe5add5db2924e8bedbfac64
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm, indicating a probable SEO poisoning or spam campaign. The document body contains a URL that points to a malicious redirector, which is likely intended to lead the user to a malicious site or download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=calendario+escolar+2020+e+2020+sep+pdf
    • http://files.pondviewfarmofmonroe.com/uploads/1/3/0/9/130969893/75a4598afa5b.pdf
    • http://files.rose-annerussell.com/uploads/1/3/1/1/131164474/2237495.pdf
    • http://files.hommersaakutleie.com/uploads/1/3/0/7/130775528/6995101.pdf
    • http://files.saveourchinatown.org/uploads/1/3/1/3/131381109/daleduti_muxej.pdf
    • http://files.princessinthemirror.net/uploads/1/3/2/7/132712661/79553d93.pdf
    • https://cdn.shopify.com/s/files/1/0443/0423/6700/files/sqrt_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/dufubimadiwemuvilunijif.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/32442185335.pdf
    • https://cdn.shopify.com/s/files/1/0433/8165/3655/files/86621066607.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/98666125243.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/41853773723.pdf
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/filokobon.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/junamonaji.pdf
    • https://cdn.shopify.com/s/files/1/0431/7433/0517/files/kefofalajaxirelokaxigagom.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/19015065064.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3349/files/minawewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1769/1559/files/clases_de_sustantivos_ejercicios_resueltos_5_primaria.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_off000058ed.bin
99cd706c992000d3bd7268fc98707f821a99a18b9605fc1b95454aa8edf9fc6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x58ED 5328 bytes
font_01_sfnt_off00006b14.bin
56c3af900d272d434f0fdb134506bb5127721ec6ec0edae75b187717abd7529e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B14 10796 bytes
font_02_sfnt_off00009009.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9009 16204 bytes