Malicious PDF — malware analysis report

Static analysis result for SHA-256 db833456f022e2b3…

MALICIOUS

PDF

77.9 KB Created: 2020-07-09 17:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee6f2fb0c6e391f1f873c51efa84a790 SHA-1: d929cf4e2bf24d08688b147e3f1d13a452e61951 SHA-256: db833456f022e2b3865ccd2d5677c17694aad43d64ecaed3ebf0c7cc5b9fe4ef
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one specifically pointing to a known malicious redirector. The document body, though malformed, includes text related to '2000 most common english words pdf' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a phishing attempt via a malicious link embedded within the PDF.

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.com/wb?keyword=2000%20most%20common%20english%20words%20with%20meaning%20pdf
    • http://files.jacobantoni.com/uploads/1/3/0/7/130776591/tezebojapowu-fazipafokuwa-taremuwufo-rezuvogemope.pdf
    • http://files.poleshiftnews.com/uploads/1/3/2/8/132815961/493882.pdf
    • http://files.chimerebaker.com/uploads/1/3/0/7/130739326/nereki.pdf
    • http://files.yorktonspca.com/uploads/1/3/0/7/130739375/9119020.pdf
    • http://files.elliesparkcity.com/uploads/1/3/1/3/131380875/morajefatim_mibibawutono_tidilutatetex.pdf
    • http://files.mylunarsign.com/uploads/1/3/1/8/131857482/6fcae3.pdf
    • http://files.corningnybaptist.com/uploads/1/3/0/9/130969834/5860593.pdf
    • https://seponetixan.files.wordpress.com/2020/06/suxirif.pdf
    • https://vasovobila.files.wordpress.com/2020/06/nejewasamusuwanenaripu.pdf
    • https://rilejeselu.files.wordpress.com/2020/06/tibidikedureziwosikera.pdf
    • https://folupovul.files.wordpress.com/2020/07/gapunavebazigewanuje.pdf
    • https://lopojezo.files.wordpress.com/2020/06/99715105537.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56773010908.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jamitaribigonekadori.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/banen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.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_off0000f262.bin
905b2d45a645f513b813c3b80979e892b39abba400ac918d09ac0b3a513acc5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 5628 bytes
font_01_sfnt_off00010554.bin
39e47822f19da75a9b45544ce4beb7d38dcde8f4cca740ffd4c04c4ae93b2091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 10720 bytes

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