Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86749441f6c6657…

MALICIOUS

PDF

39.5 KB Created: 2020-08-05 04:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be1a1f112596b1c15b941d585aaf0f26 SHA-1: 11ca00ac3d2108e5ff64576972da204dc894bd81 SHA-256: d86749441f6c6657e04381eb395bf9b39b357a051efbd715287a1c87a74d47bc
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The document body, though partially corrupted, includes the URL for the malicious redirector, suggesting an attempt to direct users to malicious content under the guise of academic or informational material. 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=pharmaceutical+importance+of+carbohydrates+pdf
    • http://files.m3dfea.com/uploads/1/3/0/8/130874324/jususofanuzav_rugovojudam_pagefirunalur_zosemonikoji.pdf
    • http://files.rexminibrick.com/uploads/1/3/0/7/130775309/tomebusuvar.pdf
    • http://wigujuzuw.greybeardadventurer.com/uploads/1/3/1/3/131380042/64a69.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/livoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/76944003522.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/kuwoduwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/3463621948.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/74716258921.pdf
    • https://cdn.shopify.com/s/files/1/0429/8145/8069/files/kikikopedulusekuwibane.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/hold_mail_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/5591/3879/files/44661002208.pdf
    • https://cdn.shopify.com/s/files/1/0434/2356/3925/files/mumasavipugazadofivuroz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3077/3913/files/41503915047.pdf
    • https://cdn.shopify.com/s/files/1/0432/0729/5140/files/boolean_rules_for_simplification.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/17220854603.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/60498198055.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_off00005b61.bin
1e7093e8f530d2cb30cfbe4ce7f59cb337511509bd25b45a918ff5120a1416d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B61 5640 bytes
font_01_sfnt_off00006e66.bin
00d3b4e43adb71a5e48e472efb5a1dab38dc30cd62fc9c2059d05b5f503ba9a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E66 10084 bytes

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