Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e8f4439589f518…

MALICIOUS

PDF

75.9 KB Created: 2020-07-15 15:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f17bea71ce293a75961b18e8a4bc177b SHA-1: cea7e4b4e848352fc9f2c74f59826e62c990eddc SHA-256: 68e8f4439589f5180b4ec89b73e2fe4b2735958c919892cf6e7446e8054a5370
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.cc/wb?keyword=eras%20protocol%20colorectal%20pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of numerous external links suggests an attempt to direct users to potentially harmful websites, possibly for phishing or malware distribution.

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=eras%20protocol%20colorectal%20pdf
    • http://files.annieontheemeraldcoast.com/uploads/1/3/2/3/132303075/rotojitusodi.pdf
    • http://files.kidstopinc.com/uploads/1/3/2/6/132681303/foximudiwinig.pdf
    • http://files.100percentcajun.com/uploads/1/3/1/4/131437045/1564b881f66c48.pdf
    • http://files.ttphotovideo.com/uploads/1/3/0/7/130774990/1089514.pdf
    • http://files.pris-t-gis.com/uploads/1/3/1/0/131070481/7825647.pdf
    • http://files.bikelabinc.com/uploads/1/3/1/3/131379543/tefewoduj-baworeduginav-taxopotonovod.pdf
    • http://files.caitlinromeoeventing.com/uploads/1/3/1/4/131437982/055eb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pavuzuro.files.wordpress.com/2020/07/kusopesiroxeb.pdf
    • https://zorozoxagis.files.wordpress.com/2020/07/xatojumifisogunejigufokug.pdf
    • https://nobijip.files.wordpress.com/2020/06/78978728208.pdf
    • https://futidufesag.files.wordpress.com/2020/06/gubaripe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90262961418.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57032902602.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74832969368.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/naxijitomugilipux.pdf
    • https://cdn.shopify.com/s/files/1/0429/7333/1609/files/vaviwefozezak.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/relutejakimilaxevefefitif.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_off0000e099.bin
eac6047c2357ee9e22c06354918f87c20bf632bca744402585f17128319e97c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 4740 bytes
font_01_sfnt_off0000f0c1.bin
1c8172663907cb10c9a21fa03007db8dd8444b0a1254504d43a6cb7935171b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 15840 bytes

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