Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a78504b13216e2d…

MALICIOUS

PDF

36.7 KB Created: 2020-08-15 01:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e75caacde9ef123e11a65edd4e524345 SHA-1: 224c3a746e22fa6665e5f3ed67df246208a9f381 SHA-256: 5a78504b13216e2db5abf926f252e402ad533d75f2f99e4f3dabbb9f87f634c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link directing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to manipulate search results or distribute further malicious content. No scripts were extracted from this sample.

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.com/pify?keyword=song+lollipop+lage
    • http://files.percyphotos.com/uploads/1/3/2/6/132681452/xokadulosupumun.pdf
    • http://files.thanetpickleballclub.com/uploads/1/3/0/7/130775734/250984.pdf
    • http://files.morroandjasp.com/uploads/1/3/0/9/130969375/wojerodijudo.pdf
    • http://files.digitopolis.net/uploads/1/3/1/4/131409309/zomuzasofofa_puliwi_talafuxaweda.pdf
    • http://files.parshootersgolfclub.com/uploads/1/3/1/8/131857199/gezesolunajir-vakax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/texojorigerusoxuduk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/larabobed.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6734/files/gibipevujejorig.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/11196873675.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3800/files/divaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/22501664041.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/rectangle_all_formula.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/26957067672.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/aerodynamics_of_horizontal_axis_wind_turbines.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/atomic_force_microscopy.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6495/files/actual_reading_ielts_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4661/files/nabokokidakesuvowes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/ludemepi.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_off000053a5.bin
284b8980ea59eead2ad572de1d0b5141dff3740cc1771a0f3aee5fb09da4cc3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53A5 4816 bytes
font_01_sfnt_off0000641d.bin
3b4028840a0d102c18eb9b8e02203cacfb4afdafe483c8ff38b56f75ad7fdc25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641D 9956 bytes

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