Malicious PDF — malware analysis report

Static analysis result for SHA-256 42db4fabc3c641b6…

MALICIOUS

PDF

41.0 KB Created: 2020-08-11 13:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a88e335bce013397459d6752e9410ca1 SHA-1: def26e18ac62ad5cede7ef56613af281ca05e2bb SHA-256: 42db4fabc3c641b64b616e982b78f25574dcc43bbeef26d552b875312500aa0c
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'PDF to word converter free' and the malicious URL, suggesting a lure to a malicious site. 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.ru/pify?keyword=pdf+to+word+converter+free
    • http://files.rowseyforthehouse.com/uploads/1/3/0/9/130969999/vagotavuretukuduj.pdf
    • http://vawaju.robertrosell.com/uploads/1/3/0/7/130776433/xavuluduxukikozow.pdf
    • http://files.lwordstory.com/uploads/1/3/0/7/130776131/noxubuduto_netasujijamabe_zixebu.pdf
    • http://files.balancedmedispa.com/uploads/1/3/1/4/131452904/dd7292618d28637.pdf
    • http://refukawu.subsurface-baits.com/uploads/1/3/1/4/131437515/mexabel.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/bujerewifebibidogaxirur.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/kotor_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0429/3997/3788/files/92702258159.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/68723699497.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/cost_and_management_accounting_n6_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/1553073196.pdf
    • https://cdn.shopify.com/s/files/1/0447/4391/7719/files/endlessly_beautiful.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/84937033534.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3800/files/38423251216.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4986/files/borofularixobodovofawa.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_off000065a6.bin
abfeb6445facd843d4e3eb48d422096da1c472a22fed4ee774ca3e711b953eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A6 4748 bytes
font_01_sfnt_off000075ef.bin
eee3e632cb8c1e50933fa36257b328ed03c4cb0a1906c4e6571be9c9f26f5aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EF 9860 bytes

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