Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd3a0a5baafd93a…

MALICIOUS

PDF

43.4 KB Created: 2020-08-16 17:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1499f8528d5e4fd18e562debde3f46a1 SHA-1: 1438851c17abde86439ff572962ff91208ac4b33 SHA-256: 2fd3a0a5baafd93abe7d47a9a192405de7a5070fe92e0d719c598cd192b764e8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL 'https://ttraff.com/pify?keyword=melanoma+aggressive+forms', suggesting a lure related to medical topics to entice clicks. The presence of a large number of PDF links, many pointing to Shopify domains, indicates a link farm strategy. No scripts were extracted from this sample.

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.com/pify?keyword=melanoma+aggressive+forms
    • http://zujaj.lauratofarides.co.uk/uploads/1/3/1/3/131383483/dexovenosox_domasotujuga_runegaja_gifovotajivo.pdf
    • http://files.cityskyflooring.com/uploads/1/3/1/4/131437484/8717682.pdf
    • http://files.whitneydavisliterary.com/uploads/1/3/0/8/130874257/6874100.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/46645669760.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/79794016305.pdf
    • https://cdn.shopify.com/s/files/1/0436/1561/7182/files/basic_english_grammar_for_child.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/75631157708.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/47002054999.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/revojajizena.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/45310140058.pdf
    • https://cdn.shopify.com/s/files/1/0428/5038/6086/files/rozaviru.pdf
    • https://cdn.shopify.com/s/files/1/0440/4045/4294/files/wokijaxiwosekujo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/12283162117.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/prehospital_emergency_care_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/xibuzagiteguwuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/5540/6494/files/niwejopebitanatakenezi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/xubebatitudixuvanar.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5523/files/zokezakefobizegenodelobar.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_off00006a43.bin
8b0ecd67a9a141b2f436b1f2fd2e0ddcfdfb23c0808e570000ee885ce3cc6810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A43 5152 bytes
font_01_sfnt_off00007bc5.bin
5532f5cc3f58b25bcc6d82ddc8b99a7d3893acbf18ef311ecc81021c776db1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC5 10756 bytes

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