Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb4cde945c38806…

MALICIOUS

PDF

37.1 KB Created: 2020-07-15 19:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6150eeaf0854c389b4a1f17501abebb8 SHA-1: 5117d6ce1f9f05264320cecf0eea83025eccd1a5 SHA-256: 0eb4cde945c388065b78dfc01e497f8c182d07484a7d9ce1d59e9fd945cd4b3f
174 Risk Score

Malware Insights

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

This PDF document is designed as a lure, presenting itself as a free download for study materials but containing a malicious redirector link. The primary link, https://ttraff.cc/wb?keyword=manhattan%20gmat%20critical%20reasoning%206th%20edition%20pdf%20free%20download, is flagged as malicious and likely leads to further malicious content or exploitation. The document also hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 37 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=manhattan%20gmat%20critical%20reasoning%206th%20edition%20pdf%20free%20download
    • http://files.kimkirch.com/uploads/1/3/1/8/131856331/7941606.pdf
    • http://files.strozzimeowvellous.com/uploads/1/3/1/8/131871494/5993813.pdf
    • http://files.difficultrunponyclub.org/uploads/1/3/1/6/131606954/ziwudubegurubur.pdf
    • http://files.teachervogel.com/uploads/1/3/0/9/130969658/8058178.pdf
    • http://files.nancypanko.com/uploads/1/3/1/4/131453565/d0ba666cf546.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9080/4885/files/gukojujemudune.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/sotifufex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/zegujufilexepuzotusi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7053/8406/files/tezotuwakamajilumavase.pdf
    • https://cdn.shopify.com/s/files/1/0430/0298/6659/files/gojidokofudidavefe.pdf
    • https://takekidelof.files.wordpress.com/2020/06/88356658526.pdf
    • https://rifilaru.files.wordpress.com/2020/07/zopixapujozuzal.pdf
    • https://vivifomu.files.wordpress.com/2020/07/puzuvugorerifonebagemu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/58336243773.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/nixadilujivulafetiwopune.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2743/files/63101635521.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50878135704.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/vonudadiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/13183608986.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/koxumugude.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.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_off000057f4.bin
7c130e57a9cf8fd9a59f2caa90811a1f54eeaf6d53123efac6265deb79ee736a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F4 5608 bytes
font_01_sfnt_off00006ae4.bin
65a76334db1735bc2343acebe6b4a3874488261ac3f23335dc2fab8cdfbf56b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE4 8036 bytes

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