Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91748db70740b5b…

MALICIOUS

PDF

44.4 KB Created: 2020-07-21 15:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df31085dd257b237750dd501c7dba8b6 SHA-1: eee12576b35c5c56cb2523c60164688bfda6d782 SHA-256: e91748db70740b5b5ce35b30e0f16212b9d0676d0627e920b2b9c11184065124
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised with a seemingly innocuous keyword. The document body, though heavily obfuscated, includes references to 'Waiting for Godot act 2 pdf', suggesting a lure. The presence of numerous external PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy, likely to improve search engine ranking for malicious content or to obscure the final destination. The ML classifier strongly flagged this PDF as malicious.

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=waiting+for+godot+act+2+pdf
    • http://files.theequinelink.net/uploads/1/3/1/4/131452815/tejozadubo.pdf
    • http://files.lcpbandboosters.org/uploads/1/3/1/4/131407547/mimevenuduxo-jogimodeti-pirug-xapubunetuvijab.pdf
    • http://files.thefitnessroom.ca/uploads/1/3/0/7/130775503/4168a399be21569.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9629/4051/files/8829050189.pdf
    • https://cdn.shopify.com/s/files/1/0435/2311/3119/files/48613711371.pdf
    • https://dasawiduved.files.wordpress.com/2020/07/72820401697.pdf
    • https://rogofuxeviso.files.wordpress.com/2020/06/51441062317.pdf
    • https://wedigari.files.wordpress.com/2020/06/jimikinidorusumobo.pdf
    • https://fafabozum.files.wordpress.com/2020/07/tariwin.pdf
    • https://gupedopuvi.files.wordpress.com/2020/07/17763520367.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80884551140.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/jexokiguzijoxoxevot.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/pelopesuxojuvulubolutute.pdf
    • https://cdn.shopify.com/s/files/1/0430/8815/0690/files/53864617200.pdf
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/mulogugotupezujomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/25614761018.pdf
    • https://cdn.shopify.com/s/files/1/0433/6277/9295/files/98272015114.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_off00007300.bin
2cf8aa642336bbe676a79770532117f2533c48a010d4300f0db4c8578daed311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7300 4928 bytes
font_01_sfnt_off000083d1.bin
e6ccdf37cf21a41ce30285612294adf542e8c4295a704238a71956a99ef402f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D1 9536 bytes

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