Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c30020e5ebfaf02…

MALICIOUS

PDF

34.8 KB Created: 2020-08-01 08:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da24f89eada6681e7f15011df96a4d5e SHA-1: c6ee56ac2791b4e64dfb54c7632ada798b4c2a5a SHA-256: 4c30020e5ebfaf0204b90218eae3be0717103052e0ccf789d2ecb794e4527c93
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many pointing to external PDF files. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=rochelle+ga+weather'. The document body contains garbled text but also includes the same redirector URL and several other external PDF links, reinforcing the link farm or distribution hypothesis. No scripts were extracted, and the primary malicious activity appears to be the distribution of links.

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=rochelle+ga+weather
    • http://files.miratorres.org/uploads/1/3/0/7/130775652/0c0a2944db.pdf
    • http://files.stephenvillavaso.com/uploads/1/3/0/8/130814769/zesavineminez_fasazanab.pdf
    • http://files.krethcattle.com/uploads/1/3/2/7/132740274/rekaxabologin_vilekeromero_wavogigebifobod_nozukaf.pdf
    • http://files.beautyoftruth.org/uploads/1/3/1/0/131070651/gigidokexepo.pdf
    • http://files.zippytotz.com/uploads/1/3/1/0/131070178/zefowaxupovop-wirokawava.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/dugobamipolovixaki.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/kakelefexut.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/30821387494.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/64575325839.pdf
    • https://cdn.shopify.com/s/files/1/0439/4637/7374/files/bagajedatamefifawovokila.pdf
    • https://cdn.shopify.com/s/files/1/0439/1839/3499/files/57856618609.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/vesuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25843483079.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/fujuroboxobozujake.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/vaxitupezepekugikajes.pdf
    • https://cdn.shopify.com/s/files/1/0437/0061/7381/files/85039875952.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/4428889347.pdf
    • https://cdn.shopify.com/s/files/1/0431/6446/7357/files/jekixofejuvojutorakifa.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_off00004cd9.bin
6e12adde35a01c1720b3d314fea8ed5a35c26b59a31caf42a38ab5314dac27a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD9 4980 bytes
font_01_sfnt_off00005ddc.bin
cfc3fec626df2cf27d561a01748d479e6fff8b1af02cc4c2ab723a51cdc0f559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDC 9552 bytes

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