Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5a70dbb2dda028…

MALICIOUS

PDF

51.6 KB Created: 2020-08-23 07:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7842d260243b489eec623d44f36918 SHA-1: 006718d3f952b07498d0160a2e55e767f8d44ed6 SHA-256: dc5a70dbb2dda028ce8899052564146db869f5e4b132e9a501fb55c820bdc2e2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links, including the malicious redirector, suggests a phishing or malware distribution attempt.

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/pify?keyword=alienista+machado+de+assis+pdf
    • http://files.goalkeepersali.co/uploads/1/3/0/9/130969580/midimatubipik.pdf
    • http://files.bshcare.com/uploads/1/3/0/8/130813710/752154.pdf
    • http://rumelaf.dayesoutdoors.ca/uploads/1/3/1/0/131071063/fulodoba.pdf
    • http://borumap.viana-motion.com/uploads/1/3/2/6/132683138/livupurikub.pdf
    • http://files.manyblessingsministry.com/uploads/1/3/0/9/130969932/litakekidow-viwujuvawiga.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/9439015725.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/biology_questions_and_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/arma_3_maps.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/metiliwetizo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7946/files/veiled_sentiments_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0438/1710/7618/files/bajar_aplicaciones_para_android_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/0981/8272/files/muwefetok.pdf
    • https://cdn.shopify.com/s/files/1/0435/2278/5444/files/2153047360.pdf
    • https://cdn.shopify.com/s/files/1/0437/3757/9674/files/ha_ckers_org.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/rodaver.pdf
    • https://cdn.shopify.com/s/files/1/0431/3818/7413/files/adolescent_depression_inventory.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/konevosafajugoli.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_off00007c1d.bin
9ff6b806f9444942d7f7a9e8f1ebf97f93bebd28ecc7f631acb13db45979ca0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1D 5076 bytes
font_01_sfnt_off00008d2b.bin
96f4b5cccc24f2ff03558f7db02143a4827594234774bb6499a2e0325e78846c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2B 11988 bytes
font_02_sfnt_off0000b132.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 4324 bytes

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