Malicious PDF — malware analysis report

Static analysis result for SHA-256 e792d0591e7f1907…

MALICIOUS

PDF

45.2 KB Created: 2020-08-30 08:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9904ca817dcf0e69f216abcb7f2659aa SHA-1: 2186b875c03f260b85c73612042592ed8543e879 SHA-256: e792d0591e7f1907996e244bff972c2d9632579be5771a3d0b96f89117f3948a
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.me'. While the document body mentions 'precalculus study guide and intervention', this appears to be a lure. The PDF also contains a link farm heuristic, indicating a large number of external links, many hosted on Shopify. The primary malicious IOC is the redirector URL, which is likely used to host or deliver further malicious content.

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.me/wix?keyword=precalculus+study+guide+and+intervention
    • https://cdn.shopify.com/s/files/1/0465/0313/3342/files/4351213812.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/39880238036.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/online_examination_form_2019_lucknow_university.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4071/files/jolenodogogijirora.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/42194189326.pdf
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/4th_grade_math_review_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/9699/7030/files/chakravyuha_audio_songs_free.pdf
    • https://static.usrfiles.com/ugd/9e41f0_e8c808306aae46249bbade3e535438fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8c60a7e52924ac494b06a0c2cdab01e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c70.bin
6fd5489f49b5744dda333274dc3c52e325669a0dc1ffad1649a0341000632959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C70 5268 bytes
font_01_sfnt_off00006e6a.bin
77b5ad0358647823461ae7aa4f2b846a2101a33c5c389270021546b966439dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6A 10740 bytes
font_02_sfnt_off000092e3.bin
fb10e5badbbf29d6a05184c763452604a6d256f7c208a2bb674868c670b14a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E3 16144 bytes

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