Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de16e891eab0d1d…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 05:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e92df31207f27e09fedf76dec3e7867 SHA-1: 79bf15540c9680e2d429097fe82b5329bcd4dadb SHA-256: 7de16e891eab0d1dce77be5dc8bab665de3c0724732dc42ded6b65407ffaf6f6
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common technique for distributing malware or phishing pages. The document body, though malformed, suggests a lure related to medical treatment, likely to trick users into clicking the malicious link. The presence of a large number of external PDF links also indicates a link farm, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=traitement+de+l+infarctus+du+myocarde+pdf
    • http://files.westburybondreferendum.org/uploads/1/3/1/4/131406140/6015173.pdf
    • http://files.globallearning-cuba.com/uploads/1/3/2/8/132814136/zusedul-feviruxiv-piliputuna-tapukig.pdf
    • http://files.canningcomputerrepairs.com.au/uploads/1/3/1/6/131636692/tosigiwekamojiz-rilibes-wifovoritojek.pdf
    • http://files.jlsnsales.com/uploads/1/3/1/3/131380052/xomutuviko.pdf
    • http://files.2020idocs.com/uploads/1/3/1/4/131482886/8a665a60c50913.pdf
    • https://cdn.shopify.com/s/files/1/0431/0299/4586/files/peter_griffin_cursor.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/36348811584.pdf
    • https://cdn.shopify.com/s/files/1/0437/0723/6503/files/74826452340.pdf
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/lovekatodomet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/35457004925.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/tafovovebivebosekelimenet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/xipogasajigu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/46419344500.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2749/files/nalegidutazewukoxido.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/18642042168.pdf
    • https://cdn.shopify.com/s/files/1/0435/5047/4399/files/durewozu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5204/7272/files/49564192562.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_off000063e0.bin
a3836d7240bf4787aba24ca6095b54919c4c4047383512c6527cebb0e923962a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E0 5352 bytes
font_01_sfnt_off00007606.bin
7a32af4924e5d02460057a7a92a8d9cfc047a76ba2a11930abf8b1375aceef48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7606 11592 bytes

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