Malicious PDF — malware analysis report

Static analysis result for SHA-256 64de2c81c4611cc8…

MALICIOUS

PDF

41.4 KB Created: 2020-08-22 23:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9c2aeef4000ad353fbb284f8eaa03a9 SHA-1: 3477b6227cad52f59f7e13622b12b853507f3ca6 SHA-256: 64de2c81c4611cc82ed04d9de57729f6185714cec6438b765eff327f2aa02ae4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or phishing attempt. The document body, though obfuscated, contains text related to an 'adaptation of animals worksheet grade 4' and includes the malicious URL, indicating a lure to trick users into visiting a potentially harmful site. 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.
  • 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/pify?keyword=adaptation+of+animals+worksheet+grade+4
    • http://files.poemsandreflections.com/uploads/1/3/0/7/130775897/valunu_jijinos.pdf
    • http://suvupaza.arnikafuhrmann.com/uploads/1/3/1/3/131398091/c89384acb6d.pdf
    • http://jaketafa.hairymosquito.com/uploads/1/3/0/9/130969690/bofoz.pdf
    • http://files.mrsbrummer.com/uploads/1/3/0/7/130738696/seramokakevuzilo.pdf
    • http://files.hkisia.org/uploads/1/3/1/3/131398091/neguberovotule-gizaxowow-vanerawix-vukawigezagumak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/vavuzagewepiwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/ruxemu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9118/files/92828639402.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/75469627343.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/93249850360.pdf
    • https://cdn.shopify.com/s/files/1/0432/9419/5870/files/altered_carbon_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/40350654415.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/avatar_movie_telugu_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0433/4629/6982/files/43808708395.pdf
    • https://cdn.shopify.com/s/files/1/0435/7806/5059/files/95131827950.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/numurininata.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_off00006229.bin
a9e7ae0dac0a8f614b7e01270b9d60931bc02188ac83c431c95accc3660df2b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6229 5688 bytes
font_01_sfnt_off00007576.bin
5021c4cf95539f916e899cd549dd4348d9d7fa5e94770c422320ac3ecffb34e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7576 10176 bytes

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