Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d67810687bc74f…

MALICIOUS

PDF

52.9 KB Created: 2020-08-04 13:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 053d2c51d3dbf143e00854fd022b3f3f SHA-1: a508f1d56546d38f80124ba2483e8cbca2ed2141 SHA-256: f8d67810687bc74fe15902ec1d111b712cdc3fa4f78901c63cb29a8aaac7af4b
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a URL designed to lure users into clicking further. The document body, though heavily obfuscated, contains the text 'Ap calculus limits review pdf' and the malicious URL, suggesting a lure for educational content. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm designed to obscure the true malicious destination.

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=ap+calculus+limits+review+pdf
    • http://files.communityfunddarien.org/uploads/1/3/0/8/130814439/502699aa18.pdf
    • http://files.kristenlaudance.com/uploads/1/3/2/6/132682790/vuloponobomena.pdf
    • http://files.100daysofimp.com/uploads/1/3/1/4/131406036/zopage_bafesoxasevav.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4338/files/3263942208.pdf
    • https://cdn.shopify.com/s/files/1/0438/4007/7986/files/84865034654.pdf
    • https://cdn.shopify.com/s/files/1/0429/0877/8663/files/8026266432.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42386580717.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/47190339310.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/88104910426.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/sapukuxusujivojadepovuwob.pdf
    • https://cdn.shopify.com/s/files/1/0429/0566/5703/files/96514830922.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/xizipudonuwevebeno.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/wirenelubujezoka.pdf
    • https://cdn.shopify.com/s/files/1/0431/7554/2950/files/ralalofemajemetufolax.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/44948716433.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/83178625643.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000713a.bin
456ec21ec262a4e3ec70e1e1723c9dcc08512791800ab3932bea89503baf6289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x713A 5440 bytes
font_01_sfnt_off000083b1.bin
87f4dc9fc1dc24012f317389c1eb0370a9430534078bbe5b7f9ba8065666d42c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B1 1956 bytes
font_02_sfnt_off00008cd2.bin
6b3a406fb55aeade5300946d2fe5f43d64c3a64ce684fd5ee2bba8aa544843c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD2 10240 bytes
font_03_sfnt_off0000afc5.bin
af193d17b6797b5ef7cc45c9af65054a32dca6e70c8800634d5c158a3e472dea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC5 16476 bytes

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