Malicious PDF — malware analysis report

Static analysis result for SHA-256 792366c9523ece0d…

MALICIOUS

PDF

55.5 KB Created: 2020-08-24 10:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b00fcb85fe65dc1c996ba6939a4b2f22 SHA-1: 94c0f6175eb740c8be4c292eef266087cf60eb1f SHA-256: 792366c9523ece0d779f910cef0382dc7eeae3715a82e404514b64ca95603ce6
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to manipulate search engine results. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to malicious content or phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=mi+home+camera+360+manual
    • http://togipe.devitthouse.com/uploads/1/3/1/1/131163658/relir_japexifelasusa_julowoxuzegu_sikuweva.pdf
    • http://files.scfsoftballclub.com/uploads/1/3/1/4/131454567/237483.pdf
    • http://jujagoji.evewelch.com/uploads/1/3/1/4/131438437/kotaroxepe-tedejat.pdf
    • http://jegarakob.dsmtoolworks.com/uploads/1/3/1/4/131453674/fugevujajabi-navogopa-jevosebutof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/nojirepoxotilirako.pdf
    • https://cdn.shopify.com/s/files/1/0457/6680/3622/files/saa_poster_presentation_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/c_est_ou_il_est.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/baroque_architecture_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/6090/4615/files/14832609698.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/46657755240.pdf
    • https://cdn.shopify.com/s/files/1/0436/2895/3763/files/calendrier_2020_tunisie.pdf
    • https://cdn.shopify.com/s/files/1/0437/7932/6103/files/nascar_games_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/veximajowogema.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/42320457651.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/77398972570.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/xexuzitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8528/2980/files/24081327505.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008eb2.bin
9b23aa4ff6ff12e9d330c835d546785dbccbae344bf4be17569473b94d3fa678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB2 5128 bytes
font_01_sfnt_off00009fdc.bin
e88acf73b3a477b2e46bbd1513a4d9641ba4f673eca8a84e3264f6e66daa3c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FDC 10192 bytes
font_02_sfnt_off0000c2b7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B7 4324 bytes

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