Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bfe0035806496c…

MALICIOUS

PDF

39.5 KB Created: 2020-09-15 09:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01694107155ca163c87332b31c55d955 SHA-1: 347be838b0cda0358ff6f5ffa0a4abb04b4dce22 SHA-256: 08bfe0035806496c9f579118e9b6117bedd0a0a86b91cb757c8c2d5982d78c67
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spam campaign. One prominent link directs to a known malicious redirector, indicating a malicious intent to lead users to harmful content. 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=nissan%20frontier%20manual%20transmission%202020
    • http://files.drivenbrand.com/uploads/1/3/1/3/131382346/b45336133.pdf
    • http://nalexen.bambus-produkte.info/uploads/1/3/0/7/130776661/111631.pdf
    • http://mojoti.takaikari.com/uploads/1/3/1/8/131871390/01285.pdf
    • http://tejegaxi.monroeyouthcommission.org/uploads/1/3/0/7/130776418/ruforopud_bomamurusul_tufusobina.pdf
    • http://sasufo.helpurchild.net/uploads/1/3/1/6/131606271/gufoxufu_romugiv_tizitazejodup_fokoxaso.pdf
    • http://files.cynthiawidawski.com/uploads/1/3/2/6/132682882/gizetane_zofike_selodajazujul_dizofeju.pdf
    • http://fonowidob.sphsmagnet.com/uploads/1/3/1/3/131379578/3ef2f91e83757.pdf
    • http://wuwazux.bernhard.co.at/uploads/1/3/1/6/131637517/wixomu_gatagus_votamamar_tirori.pdf
    • http://dolud.onpointgreatdanes.com/uploads/1/3/0/9/130970009/nerab-gezilipulatil-mosezumedota.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4644/4960/files/zatuvesiteni.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/mitejunokigusenugilavazib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nidosavexurirevinuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/mobuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7149/5574/files/pogepubumamodalajawaf.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c65.bin
8b4844e64e084d296e05df95c414fc45fa09eea5c216ebf095543d74b85641aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C65 5156 bytes
font_01_sfnt_off00006ddc.bin
41c05ff7433cb81be54095a212d498c47bda5283c0bdaff3d2e59a5714ebcbed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDC 10400 bytes