Malicious PDF — malware analysis report

Static analysis result for SHA-256 6058acb4b2c3dc55…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 22:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeb6b45665f819c0ad6662d90161b3a1 SHA-1: fbc3b0ce09cc0e31b532ea5ce2de4f9b5a3e7f73 SHA-256: 6058acb4b2c3dc5534953c4ac686fe224e21eff70f7098766a0629d818cc4aee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, appears to contain the primary malicious URL, suggesting an attempt to lure users to external sites. The ML classifier strongly supports the malicious verdict.

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=socialismo+ut%25C3%25B3pico+e+cient%25C3%25ADfico+pdf
    • http://gaxiv.josephhickman.com/uploads/1/3/0/9/130969060/5966116.pdf
    • http://dapusokev.edtechporium.com/uploads/1/3/2/6/132680813/wigevasefo.pdf
    • http://files.gaindetalks.com/uploads/1/3/0/8/130874629/dojoja-kefuzegomoli-wadab.pdf
    • http://jawetom.hollymsmithphotography.com/uploads/1/3/1/3/131380999/4881892.pdf
    • http://reluduzak.babysignswithmissmary.com/uploads/1/3/0/8/130874457/fenetife-nedomedaligexo-losub-velodekate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/7191/7471/files/normal_blood_pressure_level_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/kogazijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/dulupebuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/3771/9717/files/87922160296.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/samsung_company_introduction.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7433/files/fosawaliduteb.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/pilisifesigukax.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/rasojimubusumapimaxino.pdf
    • https://cdn.shopify.com/s/files/1/0448/2210/2173/files/32974026494.pdf
    • https://cdn.shopify.com/s/files/1/0436/7056/9113/files/towikuvumatavusuna.pdf
    • https://cdn.shopify.com/s/files/1/0434/0639/3496/files/26411819413.pdf
    • https://cdn.shopify.com/s/files/1/0429/7470/7868/files/rupaul_season_6_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0431/3913/7702/files/86263689131.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/order_of_adjectives_exercises_advanced.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_off00006a9b.bin
4928c26d741f4c72de50c41c976df2c2dddf9f8a0863f08922d59a46a7dbd300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9B 5500 bytes
font_01_sfnt_off00007ced.bin
366b5775667c62028480dc080968ca80c39f4d8d1c91dca9c7499538596d6207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CED 11320 bytes

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