Malicious PDF — malware analysis report

Static analysis result for SHA-256 341829536718e5a4…

MALICIOUS

PDF

54.8 KB Created: 2020-08-12 07:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8945350533dc5880cf0f912fdbda0db SHA-1: f928f4dd9a910c29e6815d4bd2dc3bb5c806ba94 SHA-256: 341829536718e5a4381e9dd14173dc47024bf968e8fa47a27d6a772c9500a37c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as 'argumentative writing examples'. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive 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=argumentative+writing+examples+pdf
    • http://files.drawlondon.co.uk/uploads/1/3/0/7/130739744/xilikov.pdf
    • http://files.thejournalofpolitics.org/uploads/1/3/0/8/130814785/bidefasidebug.pdf
    • http://files.prairieskycreations.ca/uploads/1/3/2/8/132814980/kiwasewusajeko-wiruronov-razanunogogufip-rafonixuxenadu.pdf
    • http://files.avcri.org/uploads/1/3/0/8/130874143/4541112.pdf
    • http://files.sleukrithmotionpicture.com/uploads/1/3/1/4/131453312/xixasudinan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/44967239851.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0314/files/88738938935.pdf
    • https://cdn.shopify.com/s/files/1/0434/5017/1554/files/fenakegofilolukalene.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/30328896189.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8557/files/wepilevojujopizedafisuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdf
    • https://cdn.shopify.com/s/files/1/0436/4373/2126/files/6500967100.pdf
    • https://cdn.shopify.com/s/files/1/0433/2532/5467/files/xowufukibowizasazeke.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/nabosevapinagirufedife.pdf
    • https://cdn.shopify.com/s/files/1/0435/5876/4696/files/how_to_make_bookmarks_appear_automatically_in.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/44906885508.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_off000096b8.bin
8afda50693dbd476836ae9bdfa68e1c8848d936a51f13057da768a6060f52b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96B8 5572 bytes
font_01_sfnt_off0000a9a6.bin
9ca3fd73f68639ec241602b8665056303930fc3772dc5bf69dfb6f1b5b2762a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A6 10640 bytes

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