Malicious PDF — malware analysis report

Static analysis result for SHA-256 68eddb9514b17d39…

MALICIOUS

PDF

51.4 KB Created: 2020-08-11 21:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb139dcb1b0d7b56c497bbf60e7bd843 SHA-1: 768d26a6789012a34b52c17263be2f87a3a60afe SHA-256: 68eddb9514b17d39552ba11175945db9a26593882be4e30448037d5da372f745
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains references to 'skf bearing book pdf' and the malicious URL, suggesting a lure to download a PDF. The ML classifier strongly indicated maliciousness, and the presence of multiple external PDF links points to a link farm or redirection scheme.

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=skf+bearing+book+pdf
    • http://files.weareslta.org/uploads/1/3/2/3/132303082/8199502.pdf
    • http://files.lifeessencesllc.com/uploads/1/3/1/1/131164552/waterogef.pdf
    • http://files.mrtoddsclassroom.com/uploads/1/3/1/0/131070493/a2cea6a430.pdf
    • http://files.southerncww.com/uploads/1/3/0/7/130739699/dolulo.pdf
    • http://files.paulwoottenbooks.com/uploads/1/3/2/8/132815882/fugipokotifin_belul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/gaduk.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0297/files/89753125987.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/vadefudiwokepem.pdf
    • https://cdn.shopify.com/s/files/1/0433/2165/5464/files/unable_to_add_text_to_document.pdf
    • https://cdn.shopify.com/s/files/1/0437/4183/9514/files/rockstar_social_club_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2306/4488/files/english_crossword_puzzles_with_answers_for_class_3.pdf
    • https://cdn.shopify.com/s/files/1/0436/9966/7099/files/19033234473.pdf
    • https://cdn.shopify.com/s/files/1/0433/5956/8027/files/desefevenolumusodabu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/50124525302.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/samolilolabukewelexoxutu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/62216205017.pdf
    • https://cdn.shopify.com/s/files/1/0433/5278/5055/files/lumam.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7841/files/full_body_workout_routine_for_weight_loss.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_off00007dea.bin
0c3bba4c59f139dc4ac6f0b794ba99234f14aac5c8815fd788244c08c1e4332b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEA 5012 bytes
font_01_sfnt_off00008ef2.bin
f0c11938f91c87a53e96840f8541168c0223224bbbf1dd60398b2b3d948e702d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF2 10484 bytes
font_02_sfnt_off0000b292.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 4324 bytes

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