Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ce2c7bba596079…

MALICIOUS

PDF

41.4 KB Created: 2020-08-20 04:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 264feba625b48b0f632b53afd01b22ac SHA-1: 185c2a275fbe8d2aa78c4ef460ffffabcc8096eb SHA-256: 20ce2c7bba596079572b62179f5d0c62fda0e47389ef621b4bc9c83b7fe35508
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external resources, a technique often used for SEO poisoning or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to sheet music and the malicious URL, suggesting a lure to trick users into clicking the link. 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.ru/pify?keyword=santa+baby+duet+sheet+music
    • http://tefijula.amandaesorensen.com/uploads/1/3/1/3/131380606/ae2794a.pdf
    • http://files.evanburgerportfolio.com/uploads/1/3/0/8/130874495/xovev_lolisepakejado_gejudosomefo.pdf
    • http://fagefokab.chargingmoosemedia.com/uploads/1/3/1/4/131438800/welezikajowusevolaju.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/basic_arabic_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/margaret_atwood_alias_grace_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/kewogetirogixuko.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/best_choir_vst.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/audit_risk_journal.pdf
    • https://cdn.shopify.com/s/files/1/0430/4306/1913/files/korg_pitchblack_chromatic_pedal_tuner_manual.pdf
    • https://cdn.shopify.com/s/files/1/0441/1329/7560/files/48040083095.pdf
    • https://cdn.shopify.com/s/files/1/0436/7722/1017/files/vegugujezevekikeviba.pdf
    • https://cdn.shopify.com/s/files/1/0444/5110/2887/files/canon_eos_rebel_t6i_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0455/8025/5397/files/restaurant_business_plan_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0352/6820/files/bose_soundbar_500_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/adjective_word_order.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006436.bin
7d858334dfea8a7a1feb364e8d2cce5bb8021e17c9d18ac8f19869491bf856b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6436 5396 bytes
font_01_sfnt_off0000765f.bin
71109c59431381426d07ed7421b82116c23b797430dad2f3955fe5039283ac63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765F 10148 bytes

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