Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f1a95d792f111a…

MALICIOUS

PDF

42.0 KB Created: 2020-08-23 11:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cefa735fef455477857546fa0d235463 SHA-1: af9f58f3f662f0e2d816d6a0b814ebf6e148237a SHA-256: f1f1a95d792f111afae09a7854a7c746e97ccf15899c3dd0804d25913b479bb2
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, many of which point to a link farm hosted on Shopify. The primary malicious URL, ttraff.cc, is identified as a redirector. The document body, though heavily obfuscated, contains text related to a 'Kth phd thesis template latex' and the malicious URL, suggesting a lure to a phishing or malware distribution site.

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=kth+phd+thesis+template+latex
    • http://files.antonthomasart.com/uploads/1/3/0/8/130814861/5938178.pdf
    • http://filori.westdenegreen.org.uk/uploads/1/3/2/7/132740324/408e8d0805.pdf
    • http://files.craniosacraluk.com/uploads/1/3/2/6/132682822/virisiborab.pdf
    • https://github.com/jcanton/mechthesis.git
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/8230141385.pdf
    • https://cdn.shopify.com/s/files/1/0431/2776/7206/files/laporan_pendahuluan_kista_ateroma.pdf
    • https://cdn.shopify.com/s/files/1/0438/2087/5938/files/54535818781.pdf
    • https://cdn.shopify.com/s/files/1/0434/3680/2204/files/rujekiselut.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/xexokiwinadosaja.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/39464928130.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/adobe_reader_for_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0436/9691/4600/files/teja_bhai_film_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/0838/5439/files/5989537105.pdf
    • https://cdn.shopify.com/s/files/1/0435/9687/3885/files/nevifinowutefenujusidusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6051/0376/files/benim_hocam_geometri.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/bititozodufazozugufimi.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_off000053b9.bin
7b511aad29477f756f2138ce139d34e3436f542922bac58101571f3d5260a3d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B9 4712 bytes
font_01_sfnt_off000063c2.bin
4b1f97566ff6acf44a324b520fe199656bdda5413f753e56992a662d6612fa5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C2 12824 bytes
font_02_sfnt_off00008cf5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF5 4324 bytes

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