Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa43643f508854d…

MALICIOUS

PDF

34.2 KB Created: 2020-08-12 07:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 996afe63647cb28cd26747849eb6eac4 SHA-1: b10dd4f6ef68b27ed8e97c04c47ea06f958e3c0f SHA-256: 2fa43643f508854d335d7cdf43919335040ea1ad5becf3e252f19e9eb2d3a93e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=math+olympiad+books+pdf+free+download', is designed to lure users into downloading further malicious content. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm used for SEO poisoning to attract victims searching for specific content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=math+olympiad+books+pdf+free+download
    • http://nekep.thehealthymusicianproject.com/uploads/1/3/2/7/132710621/5c36b45b08aa5d9.pdf
    • http://files.orilingo.com/uploads/1/3/1/4/131437632/ac441742794885a.pdf
    • http://kimunamuw.my-english-lesson.us/uploads/1/3/0/7/130740044/futuxonamibesozo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/vijuniruse.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/77148673429.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2545/files/bootcamp_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/bootres._dll_corrupt_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/flow_free_9x9_level_8.pdf
    • https://cdn.shopify.com/s/files/1/0429/3433/7695/files/dozowekamibipinir.pdf
    • https://cdn.shopify.com/s/files/1/0440/8023/4661/files/rizivugamem.pdf
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/55580580660.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/burefizaramapomile.pdf
    • https://cdn.shopify.com/s/files/1/0430/4135/7973/files/tesizonajogibusubewufaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/81358267826.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004657.bin
a375cde0f8537988fafff5bcc9d2cf8ec982cf8a4ab74c46980aab3c7756ef46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4657 5684 bytes
font_01_sfnt_off000059a0.bin
37a592c9ab1d91388bce8b2d43f5b7bf241071d851e7f831906c7b4bd55b183c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59A0 10072 bytes

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