Malicious PDF — malware analysis report

Static analysis result for SHA-256 05148aa84653abc3…

MALICIOUS

PDF

42.1 KB Created: 2020-08-07 06:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 390222b62cfa94a9f66ea86a68d59186 SHA-1: 40d31e0e943ae8b19a991eae4543dc5b94559a19 SHA-256: 05148aa84653abc35e1db68d536766465a5be04ed84cef919a7f8a305afd9a0b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and also for containing a large number of external links, characteristic of a link farm. The embedded URL https://ttraff.ru/pify?keyword=probability+distribution+binomial+poisson+and+normal+pdf is identified as a potential malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify-hosted PDF links, suggesting a spam or phishing lure.

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=probability+distribution+binomial+poisson+and+normal+pdf
    • http://files.salon218dayspa.com/uploads/1/3/2/8/132814387/masuwedosog.pdf
    • http://files.heathermclaurinart.com/uploads/1/3/1/4/131407818/zivatuxasemonu_kulutawigo.pdf
    • http://files.nbpeipublichealth.ca/uploads/1/3/1/4/131406668/pejevekudikuju-ruvivadupem-zomido-nenujele.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/2995057762.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/ukulele_chord_chart_beginner.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0441/0051/8040/files/bavifipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5189/2381/files/rikumodidovoxefategobeda.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0293/files/trumpet_fingering_chart.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/31051648728.pdf
    • https://cdn.shopify.com/s/files/1/0437/6143/4773/files/pezituneporibe.pdf
    • https://cdn.shopify.com/s/files/1/0439/3077/9816/files/qualities_of_a_good_islamic_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2216/files/modern_physics_randy_harris_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/87323780844.pdf
    • https://cdn.shopify.com/s/files/1/0433/8155/5350/files/zogaxovudos.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/11600619621.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_off00006630.bin
caef28fdb763d1e28ab3647fe88a748311de556f307e0383f90cb07bfecdfe07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6630 5432 bytes
font_01_sfnt_off00007891.bin
7c347d86b378fcbf89a21628ba7e62b49d38d0845fd2d7342c0ea156f0b4fb61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7891 10120 bytes

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