Malicious PDF — malware analysis report

Static analysis result for SHA-256 61acfe84d36a112f…

MALICIOUS

PDF

50.2 KB Created: 2020-07-29 17:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e77b7504cc85256ce36eb0183c126b7 SHA-1: 404286dc5838c187668c953cdc61ea4111f34c41 SHA-256: 61acfe84d36a112f4ba317f7dc4e0ccd7bbbce8206c141d1f1c5db139a604100
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to Shopify domains, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'translation fragments'. The presence of embedded URLs and the ML classifier's high confidence score strongly suggest this PDF is designed to redirect users to malicious sites, likely for further exploitation or malware delivery.

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=t%25C5%2582umaczenia+fragment%25C3%25B3w+zda%25C5%2584+angielski+pdf
    • http://files.sabelrentals.com/uploads/1/3/1/4/131483020/d398b32f006.pdf
    • http://files.abrahameducation.com/uploads/1/3/1/4/131406659/kilanekiti_jowodat.pdf
    • http://files.smokedearthceramics.com/uploads/1/3/0/7/130775379/99cccdf5ca050.pdf
    • http://files.melodiousstrings.com/uploads/1/3/0/8/130874189/605494.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/vopotuxefigexo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1450/files/49057949041.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9817/files/givugaxakidowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5005/files/fogufesidelevomade.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/wedosojowodugazofogoriw.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/mepogikutaroxasuxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/gelolitadafibivogirele.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/vexodarazadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/1940271745.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/45794191630.pdf
    • https://cdn.shopify.com/s/files/1/0434/9578/4600/files/kepozadanikalunug.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000770d.bin
6e2554de3be3e879ed24f70a067f9406b98cdc1a6cf90ffb66515d93246a5e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770D 5724 bytes
font_01_sfnt_off00008a3b.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3B 1800 bytes
font_02_sfnt_off000092c8.bin
1c8031dca86f76b7685a069eca6c9c8c4baf615090d328f46d9c39dc5c295ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92C8 12384 bytes

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