Malicious PDF — malware analysis report

Static analysis result for SHA-256 782736a2e357cf32…

MALICIOUS

PDF

58.9 KB Created: 2020-08-18 14:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 556e6ff895add5bc70f5247a8256fde7 SHA-1: 12be61f267ea3b5af3af7768dc95a5fbbe90f184 SHA-256: 782736a2e357cf32edede505ddd90a41ff94d3766f672ab875ecae29269a90f5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=hysys+tutorial+distillation+column+pdf'. This URL is likely used to redirect the user to a malicious site or download further malware. The document also contains a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure malicious links. The ML classifier also strongly flagged this PDF as malicious.

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=hysys+tutorial+distillation+column+pdf
    • http://kowuda.dp-art-gallery.com/uploads/1/3/0/8/130874620/78c7b3919060.pdf
    • http://wezewax.dzaka1908.com/uploads/1/3/2/8/132815176/laxutoret.pdf
    • http://files.sharrattwater.com/uploads/1/3/1/0/131070920/riwilujo-nazepomotobaj.pdf
    • http://mujurin.iguanamercenary.com/uploads/1/3/0/8/130813988/rasulenuk-gutoboxiv-kagokabipabeb-xofer.pdf
    • http://files.psychocare.org/uploads/1/3/1/4/131453982/xusozigik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8154/7417/files/mobefosefebodadadegabax.pdf
    • https://cdn.shopify.com/s/files/1/0432/5428/4450/files/risuzulovoxikaras.pdf
    • https://cdn.shopify.com/s/files/1/0437/1575/6181/files/nsfw_subreddits_411.pdf
    • https://cdn.shopify.com/s/files/1/0432/3996/4834/files/colouring_fractions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9102/5303/files/79282942475.pdf
    • https://cdn.shopify.com/s/files/1/0441/3010/7544/files/sotarixutoregezewe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9720/1576/files/wapasilog.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/56774242645.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/pegunevijomumota.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/botagebixunowatuniwotomun.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/ramine.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_off0000a991.bin
feab480b496ae84663a94e67434d601e797b6d1046e5fdf1452eaa1b42e5cb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA991 5364 bytes
font_01_sfnt_off0000bbba.bin
a2de63a2f956fde02eba2ab5133afb1aa8d1e176432dc3a41fe8f55b53c55446		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBA 10208 bytes

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