Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b183e887d95305…

MALICIOUS

PDF

39.7 KB Created: 2020-11-05 14:24:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d118723c1d987fb0e98a5c3982d5082 SHA-1: 7a040eaffbfa3c0c040c2abf575127170d4dc798 SHA-256: 03b183e887d953058a82aeb57d4a24ea45d04188c908f9abd52f0d90c8121c3b
102 Risk Score

Malware Insights

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

The PDF document contains embedded URLs, with one identified as a malicious redirector. The document body text, though obfuscated, includes language suggesting it is an 'unofficial transcript' and contains the malicious URL, indicating a lure to trick the user into clicking the link. The ML classifier also 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?keyword=unofficial+transcript+usm
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f9cfbd6ea8f2.pdf
    • https://cdn-cms.f-static.net/uploads/4450156/normal_5fa342265ddae.pdf
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f871f7cd2d5a.pdf
    • https://cdn-cms.f-static.net/uploads/4423171/normal_5f9ec221133a0.pdf
    • https://xufizigox.weebly.com/uploads/1/3/4/4/134479456/xaviz-tagalesapubalof-gixopatas-jufuzipuxukabu.pdf
    • https://daxuferawul.weebly.com/uploads/1/3/4/5/134592581/nozezijoditig-pumixuxubif-baluxenegupo-fojafatoz.pdf
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f9b7164b4c73.pdf
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5f91ce8c880d2.pdf
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/a4847d53a2a.pdf
    • https://jolefopasovoja.weebly.com/uploads/1/3/4/4/134402584/fbd97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tulosa/tavelorida.pdf
    • https://s3.amazonaws.com/midaguvimabof/64827530369.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_off00005adf.bin
504a42967ee2c23266131ed995da3e9db904124aac7af7f5c598352610406ad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADF 5152 bytes
font_01_sfnt_off00006c5a.bin
356283dd986ef588116435cd27453994e414a018aca69c9d95396047edadb77f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5A 11252 bytes

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