Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a7a465e6926889…

MALICIOUS

PDF

34.7 KB Created: 2020-08-12 05:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b44145259a46954759ab14cb55cf313a SHA-1: 090b02280a24481d36a872ce088de8b9bd4362ac SHA-256: d4a7a465e69268891bea570f237daa1e5bcb89972500fc274fae3fb36a00e188
150 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 a redirector service (ttraff.com). This suggests a link farm or phishing lure designed to direct users to malicious content. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

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.com/pify?keyword=walc+aphasia+pdf
    • http://files.hobymaine.org/uploads/1/3/2/7/132710786/73bd4bdbd.pdf
    • http://files.rwjbhinstructors.com/uploads/1/3/1/4/131453194/83230cf79.pdf
    • http://files.5elementscoaching.org/uploads/1/3/0/8/130814043/4725498.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2484/files/endocardite_bacteriana_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/appareil_respiratoire_des_insectes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/24981702409.pdf
    • https://cdn.shopify.com/s/files/1/0433/3935/0181/files/20865861888.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/gugibomodofugukasoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7916/3285/files/apprendre_l_anglais_dbutant.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/understanding_computers_today_and_tomorrow_chapter_5.pdf
    • https://cdn.shopify.com/s/files/1/0430/0007/0307/files/97691960449.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7049/files/39814735299.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/85520221603.pdf
    • https://cdn.shopify.com/s/files/1/0440/7525/3910/files/biotransformation_of_antibiotics.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/16901074687.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/96026217513.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_off00004adc.bin
89e3a37dbeae4f67776e17ff3219ded086628dd31ec993968bdcd912d21ea2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADC 5160 bytes
font_01_sfnt_off00005c6f.bin
5941bff59ae8089c50b8fe79327511330bdfa787f149a7975b54b7f3d47691c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6F 10080 bytes

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