Malicious PDF — malware analysis report

Static analysis result for SHA-256 af35c8933f15dfd5…

MALICIOUS

PDF

47.7 KB Created: 2020-08-02 15:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04999206f6b69a794a9446c436fe6038 SHA-1: 9267b9c4ded610a0cd46f3806c3f6049eefed9db SHA-256: af35c8933f15dfd56c8a0f19a1d3d8809d1a5376572264ab53d22fe2da6e4f82
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Uky gpa calculator' and the malicious URL, suggesting a lure to trick users into clicking the link. 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=uky+gpa+calculator
    • http://files.studio-knox.com/uploads/1/3/0/7/130738921/3eda0.pdf
    • http://files.talleir.com/uploads/1/3/2/7/132740930/mamasazaleka.pdf
    • http://files.patriciaagupusi.com/uploads/1/3/2/6/132681579/517f0e73.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/fizevobiriwegibodos.pdf
    • https://cdn.shopify.com/s/files/1/0435/6803/8049/files/82216709552.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/55064184510.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30347825404.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/11402780553.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/77533374077.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/temufaxilagig.pdf
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/xofidekaguwomipoborifo.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_off00006557.bin
d2a767771df11563d07addb837e581619541f60260b84b19bd6c6bacfea7291a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 4692 bytes
font_01_sfnt_off00007568.bin
ec361b0c4c9324a575ead71778570ae192b8909161a7ee81511c4fca76d23657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 14944 bytes
font_02_sfnt_off0000a419.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA419 4324 bytes

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