Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef5b9f7faf210c5…

MALICIOUS

PDF

42.5 KB Created: 2020-09-07 09:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 018cdb51b664e762bc8441e987cfe1e7 SHA-1: 18db587f09a8599630c1da23c282f8207092cce0 SHA-256: 5ef5b9f7faf210c5e5a890166995c1131b83df6e7618d845bb5e5b05a3ba54f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=integers+order+of+operations+worksheet+grade+8', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this URL and other links to PDF files, suggesting a link farm or redirection tactic. The presence of a malicious redirector indicates an attempt to lead the user to a harmful destination, likely 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.ru/wix?keyword=integers+order+of+operations+worksheet+grade+8
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0684/3288/files/56547350479.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/bizijawubojedodozafomiloz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0036/3169/files/pesiwadesovemefotemo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/bufubematuponada.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/43174698694.pdf
    • https://static.usrfiles.com/ugd/6846fe_0bb9e36efd0a435cb2dd134a21af889f.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_8e37f3d40acc4a80ae1723aa334dd404.pdf
    • https://static.usrfiles.com/ugd/c4f63d_a338ba3a635246e6aa2be1cf3c0e2e52.pdf
    • https://static.usrfiles.com/ugd/6da380_2abd5f1177f44fcba6ff6325b1bab5d7.pdf
    • https://cdn.shopify.com/s/files/1/0428/1915/8183/files/gowis.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/62863064939.pdf
    • https://cdn.shopify.com/s/files/1/0429/7516/6620/files/wunobarozixowabukumod.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/luxazakorutekakefuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/tetukefok.pdf
    • https://static.usrfiles.com/ugd/493135_9533925c639e4da3a5898163b575c095.pdf
    • https://static.usrfiles.com/ugd/3e9e83_e872b832fc974b6d9c715f4d1b42788c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d42d25c9b49e4e99b857bf4018648e8b.pdf
    • https://static.usrfiles.com/ugd/41f880_be09b4bf6d654f0c8972c735816a1182.pdf
    • https://static.usrfiles.com/ugd/ad8f3a_0522c74793524b86abd226ac2dd6b653.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_off00006778.bin
ed4a7cdced3e06de8b7a7e372f66ac0e1911f6aed6b021293a8ea460b613c487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6778 5556 bytes
font_01_sfnt_off00007a74.bin
f891a5a7d7e11d9c982d15c3396946144b90f3eafa6f08fb220cc724fd8edc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A74 9964 bytes

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