Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d763e77e4a96c5c…

MALICIOUS

PDF

40.5 KB Created: 2020-08-07 23:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2db93771722d1b2504ab29a1be26a034 SHA-1: 0a3da60fa8be7d65b7226d3aa90ed19745edba8c SHA-256: 3d763e77e4a96c5ce95127aec29b66e051c7611e0a892cfa4feaf541956fe122
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily corrupted, contains the text 'Bible study topics for adults pdf' and the malicious redirector URL, indicating a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious.

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=bible+study+topics+for+adults+pdf
    • http://files.shanahanagency.com/uploads/1/3/1/4/131408203/bemameviwixegu_latexetojakat_tawibupidiwido_pufixal.pdf
    • http://files.nusfolio.com/uploads/1/3/0/9/130969305/negezokinujup.pdf
    • http://files.mountainoven.com/uploads/1/3/1/3/131398419/mirevowatuwesunifit.pdf
    • http://jewodufox.absolutedoorsct.com/uploads/1/3/1/6/131606349/d396e73d956.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/types_of_cataracts.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/gezusevisobetominatofop.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/python_check_if_key_in_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/nuxafez.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/pofukibumodejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/wugotutaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/6598/0581/files/anopheles_arabiensis.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3471/files/pdf_to_jpg_converter_software_download_offline.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/84099660722.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/18007550564.pdf
    • https://cdn.shopify.com/s/files/1/0437/5999/2990/files/xiaomi_redmi_2.pdf
    • https://cdn.shopify.com/s/files/1/0449/5081/4888/files/yoga_exercises_to_increase_height.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_off00006067.bin
5ba48646a459033057576e5bce8ce5b0751673d651484c2e381d099dbaf7f312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6067 5440 bytes
font_01_sfnt_off000072f6.bin
1f27ce396ee0e5f6bb579ee6d98e94b7b8bced330f67c64188a679227e3a7c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F6 9964 bytes

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