Malicious PDF — malware analysis report

Static analysis result for SHA-256 8124743ac37f5453…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 23:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 980d826aecf70d5087b22960544f77fe SHA-1: 9411564ed4def337f3bb3cc7e5b6c3538ce0602a SHA-256: 8124743ac37f54534559d55611d4eeff435bc689baa6d2e7e1a1e58480a97fd6
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free Acrobat Reader download. The document body and heuristics confirm the intent to lure users to a malicious URL. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URLs and heuristics are sufficient to determine the attack pattern.

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.cc/pify?keyword=download+pdf+acrobat+reader+free+full+version
    • http://beredibo.apexengineered.com/uploads/1/3/2/7/132740214/c23e25.pdf
    • http://files.dustinmarquel.com/uploads/1/3/1/0/131070030/duziwudine-jujopumamulu.pdf
    • http://files.jonandkimberly.com/uploads/1/3/0/7/130775969/zakobowitofo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7245/4810/files/85976009673.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/87086563764.pdf
    • https://cdn.shopify.com/s/files/1/0433/1608/4891/files/air_conditioner_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/43426612637.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/4993738978.pdf
    • https://cdn.shopify.com/s/files/1/0432/0133/1360/files/38742021785.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/pisagua_alcides_arguedas.pdf
    • https://cdn.shopify.com/s/files/1/0428/2780/8935/files/49231929763.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/14533232471.pdf
    • https://cdn.shopify.com/s/files/1/0436/9743/8875/files/86621729309.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6722/files/68624042453.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0976/files/29093602828.pdf
    • https://cdn.shopify.com/s/files/1/0433/3636/8283/files/zuvejitazozuruf.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_off00006684.bin
a00c3c1b038cbb0c033532c41cdac1b254faed117aa22a21dd6ce112f68d5fca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 5440 bytes
font_01_sfnt_off00007928.bin
59c03b31ee8ac6e99e033a85d111e28e48b13692fa33e8ad260b4b9220c25212		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7928 9872 bytes

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