Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca58d37820acae78…

MALICIOUS

PDF

44.0 KB Created: 2020-08-22 19:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7f4847a90575cd91c4ae6e39cc35fda SHA-1: dc80d6b61795e11bed90608e38e68252412fa2ac SHA-256: ca58d37820acae78f2172db45aecab53153f80ead75757269d78efca276e3fa8
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large link farm. The embedded URL points to a known malicious redirector, and the document body contains numerous links, many of which are likely part of a link farm designed to obscure the true destination. 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=darpa+exacto+guided+bullet
    • http://files.0-projects.info/uploads/1/3/1/3/131398374/ffb74e0.pdf
    • http://files.skyesthelimitphotography.com/uploads/1/3/0/8/130815026/9962355.pdf
    • http://mofoj.customer1stelectrics.com/uploads/1/3/1/6/131606289/taredubemabapo.pdf
    • http://muwekix.aleahkouryart.com/uploads/1/3/1/4/131437724/ribitag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4551/files/it_s_just_like_a_mini_mall.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/54971769066.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/fokulotorafedubigesar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/34174741194.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3800/files/28723949325.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/zowiwetinarifikonov.pdf
    • https://cdn.shopify.com/s/files/1/0432/8741/2900/files/10008682773.pdf
    • https://cdn.shopify.com/s/files/1/0431/7993/3862/files/poguzagegibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/69896850173.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/74196692427.pdf
    • https://cdn.shopify.com/s/files/1/0435/6522/0003/files/konubifotomogasijevos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/blockchain_programming_with_javascript.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_off00006e17.bin
cef43c4068015b9cc8cf5c6170ebc97b2bd0a0b5521c6e62d1937757824c879f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E17 5268 bytes
font_01_sfnt_off0000800f.bin
0442ad394b377f8b0999955bf09f781cc1e85914ecace29ca220477879d862ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800F 10324 bytes

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