Malicious PDF — malware analysis report

Static analysis result for SHA-256 668e0cddd612eb18…

MALICIOUS

PDF

39.1 KB Created: 2020-08-21 11:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eac73ee9327f37169daabce1f22418f SHA-1: 2d3ae488e92a3a9d2c09a073d4748ad1125c431d SHA-256: 668e0cddd612eb182bb7d23086e2869f735e12163dd3c51d133f7b618ba3169d
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. The primary malicious URL identified is https://ttraff.cc/pify?keyword=high+thread+count+twin+xl+fitted+sheets, which is likely used to funnel victims to further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious links.

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=high+thread+count+twin+xl+fitted+sheets
    • http://files.321letshavefun.co.uk/uploads/1/3/2/6/132695531/347e9f.pdf
    • http://files.jimwarren.ca/uploads/1/3/1/0/131070525/wisipetejesarefowevi.pdf
    • http://files.malagasycotonclub.org/uploads/1/3/1/6/131606367/b9b56e6.pdf
    • http://tevikero.melfair.com/uploads/1/3/0/8/130873804/mudadiramusokitugiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/57598078173.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/zudebito.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/bubakariren.pdf
    • https://cdn.shopify.com/s/files/1/0436/0201/8467/files/biological_diversity_frontiers_in_measurement_and_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0438/3476/9568/files/amazon_annual_report_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0452/6155/3826/files/athlean_x_inferno_max_size_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/29264977618.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/96725514631.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/25874313316.pdf
    • https://cdn.shopify.com/s/files/1/0440/8921/3093/files/sad_song_status_video_hd.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1039/files/foucault_l_archeologie_du_savoir.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_off00004c55.bin
1f0d6b6140a57773f23bbb43f21c40b3a881dadf7c9eb6cd4552abe6d210ef24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C55 5288 bytes
font_01_sfnt_off00005e59.bin
e0654e72ebafe987ce758e526a0fc1a2f9c83f71fd595ed0d653014acb189efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E59 10208 bytes
font_02_sfnt_off0000814d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814D 4324 bytes

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