Malicious PDF — malware analysis report

Static analysis result for SHA-256 714e0f5ea5e50413…

MALICIOUS

PDF

60.2 KB Created: 2020-08-07 12:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5ab0d2b6cff215d4f8c4320ae97abb9 SHA-1: 80f8e6acd9e04f3968662cc64ad1226856335cab SHA-256: 714e0f5ea5e50413539e4c5bd5129c5da6a4626e326154259390abcc217a3850
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.cc/wb?keyword=rondo%20capriccioso%20pdf'. Additionally, it exhibits characteristics of a PDF SEO link farm, containing numerous external PDF links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. While no scripts were extracted, the presence of malicious URLs and the link farm behavior suggest an attempt to redirect users to harmful 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/wb?keyword=rondo%20capriccioso%20pdf
    • http://files.daisytowers.com/uploads/1/3/0/7/130775299/napudajavijesi-tafatot.pdf
    • http://files.americanlandscapingservice.com/uploads/1/3/2/6/132680932/28ce5cd9.pdf
    • http://files.jacarandaresearch.com/uploads/1/3/1/0/131071286/zotakid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/9149035934.pdf
    • https://cdn.shopify.com/s/files/1/0430/6875/2023/files/11075567045.pdf
    • https://cdn.shopify.com/s/files/1/0432/2466/2173/files/83063599906.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/derakotirivobobivoxusasaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/83948046384.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16485275060.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/jewuwasoviwerogusezuxelut.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/sexemupasojiwuxaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/29854015269.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/zezununipituzujux.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9666/files/28576903239.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_off0000a6fa.bin
b4845aa1408b09cd253b97deb1f372f775cdbe65a54067e1d2dce563241b7b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6FA 4712 bytes
font_01_sfnt_off0000b6f7.bin
ebbac8d7d51cce19fcfc78d8ac2bd94625242629831590330c24c7acf89e3719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F7 8920 bytes
font_02_sfnt_off0000d569.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 4324 bytes

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