Malicious PDF — malware analysis report

Static analysis result for SHA-256 08da0c7b2a431d16…

MALICIOUS

PDF

42.4 KB Created: 2020-08-01 20:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdae226a3f773536fb08ec0e0be6c6d5 SHA-1: b92607573a708002ef9f4c9fb6b47730c5707cec SHA-256: 08da0c7b2a431d162078c3dee8587591eaffa12f66c249b6607bc043dc4a923e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=side+eyes+emoji', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, consistent with attempts to disguise malicious content.

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.cc/pify?keyword=side+eyes+emoji
    • http://files.premieractprep.com/uploads/1/3/2/7/132710569/9217704.pdf
    • http://files.callowayfootball.com/uploads/1/3/0/8/130813042/zijogowimabuf.pdf
    • http://files.slidemash.com/uploads/1/3/0/8/130874110/550f2e69bf6c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/57831782212.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5137558887.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/kudovozepi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/fazivaloduxaxerilasegipip.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/29574237309.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2313/files/donozaliwuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/14933538922.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/kebokomejuzebalusidugoga.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/48595990657.pdf
    • https://cdn.shopify.com/s/files/1/0437/8807/5159/files/k_lite_codec_pack.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/sunakodevedare.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/rerebuzirasisonozulori.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/zafezirozekerifuzusu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068be.bin
93358e05dbd1fa9371792760af16aecdd5c6029b1c7087a7040be61fe5a558b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BE 4912 bytes
font_01_sfnt_off00007975.bin
ebdcb0044fa6d2b6326abd8ddfa722a0a67ab36dfcae05f2dc3a673d5b265ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7975 10444 bytes

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