Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8e4bd23d62feb7…

MALICIOUS

PDF

42.1 KB Created: 2020-08-08 23:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5faafd9ab03b79788b3e0aee75eeb95 SHA-1: 2573dd11c457ad1da19a1e5468eac7ad3769f455 SHA-256: 9b8e4bd23d62feb71749c922abbdef0e15c18cf82d9c5754ca158d90e1cd7d10
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious URL, https://ttraff.com/pify?keyword=bachelor+thesis+example+pdf, is designed to lure victims by appearing to offer a relevant document. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the PDF structure and embedded links are sufficient to determine the attack vector.

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.com/pify?keyword=bachelor+thesis+example+pdf
    • http://files.acadiabugproject.com/uploads/1/3/2/7/132740965/d188d211.pdf
    • http://files.brendathour.com/uploads/1/3/1/4/131438018/nujabelikokutuk.pdf
    • http://files.melodicfusion.org/uploads/1/3/1/4/131452959/dalizonelomas.pdf
    • https://cdn.shopify.com/s/files/1/0434/2222/0439/files/nba_media_guides.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4691/files/something_awful_emoticons.pdf
    • https://cdn.shopify.com/s/files/1/0430/0960/5791/files/totirusejopodinidiza.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/begekixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/vawofiwepupaxasir.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/6862007592.pdf
    • https://cdn.shopify.com/s/files/1/0434/6567/0806/files/design_of_classroom_action_research.pdf
    • https://cdn.shopify.com/s/files/1/0431/1711/7589/files/33973290570.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/action_research_in_science_sample.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/wubijobudugomofef.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/wow_mage_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/jiluvefil.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/96401894672.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_off000064ab.bin
3035560c88886a2a3960264b79cb6e8bb32eceef014d2791596766573030c3ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AB 5512 bytes
font_01_sfnt_off00007746.bin
054f83d53c5898eca5de032676aca763ab025ce3137605c8bf1fe35e8ae43125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7746 10572 bytes

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