Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fd04ae6ea5839b…

MALICIOUS

PDF

48.1 KB Created: 2020-08-31 00:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a96ad1516fe996ab4633704e573daa28 SHA-1: 1e30026ae1f80dd779d051a258911e51f36ae404 SHA-256: 78fd04ae6ea5839bdeda27e703460ffe50361ef672bd5a89b736e4bbb6afe9f5
152 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 malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, and numerous other links hosted on Shopify, likely part of a SEO link farm to obscure the malicious intent. No scripts were extracted from this sample.

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/wix?keyword=medha+suktam+pdf
    • https://cdn.shopify.com/s/files/1/0434/0288/7322/files/anticorpos_heterfilos.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/fonizijejosemoxovid.pdf
    • https://cdn.shopify.com/s/files/1/0432/2118/8763/files/rizoti.pdf
    • https://static.usrfiles.com/ugd/ad2ade_f5bb082ede3d46bb94bdadf5a9c27c1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_38c043821084448fb437f6f658a03275.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/15996039340.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6679/files/vajejepolomakemukuvejirug.pdf
    • https://cdn.shopify.com/s/files/1/0429/3971/1655/files/wirul.pdf
    • https://cdn.shopify.com/s/files/1/0438/4276/4962/files/social_media_calendar_template_smartsheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/26953007150.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1847/files/lattice_gauge_theories_rothe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6503/9261/files/28149697468.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_off00006545.bin
3b36a6d0cd5be7689f311098ff1b84e5efc10960ea2f5378b79ffe75c0a04552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6545 5224 bytes
font_01_sfnt_off000076f7.bin
4a68a32cf2894676189370a0ea1d03a8f77c4bdc42e290f05ee070087e837122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F7 16424 bytes
font_02_sfnt_off0000a59e.bin
a973e9300c3a4fbcfb4bfc6c5306af16a55a660f725305f497e3720ca8925c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA59E 3012 bytes

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