Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c87f3ce26288a00…

MALICIOUS

PDF

41.5 KB Created: 2020-08-12 20:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 583bd79e770d0f294dcc7733bfd08ae8 SHA-1: 1e60109f0e8bfb60c9c72a02fc6b90c62fbd20de SHA-256: 0c87f3ce26288a00ef217754f28d6bfedccf6b57ab4e7c22033ab1afe7f978c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one prominently leading to a known malicious redirector. The ML classifier and heuristic firings strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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=blood+sweat+and+tears+piano+pdf
    • http://zetufigep.cancerresearchcenter.org/uploads/1/3/0/8/130815017/xuris-mokosikiwejugo-pumamip-fobalibo.pdf
    • http://files.quayeventsgroup.com/uploads/1/3/0/8/130874238/9544215.pdf
    • http://files.codyjwoods.com/uploads/1/3/1/4/131438157/jozagipofitepevasaw.pdf
    • https://www.amchords.com/chords/1756600
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5984/6051/files/when_will_minecraft_1._14_come_out.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/cara_membuat_bookmark_dengan_adobe_acrobat_reader.pdf
    • https://cdn.shopify.com/s/files/1/0439/5122/7048/files/49689889755.pdf
    • https://cdn.shopify.com/s/files/1/0435/3975/9255/files/convert_tif_to.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/weburanefikisedovavobuzeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/5616/0151/files/32089037503.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/39131171474.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/latest_version_of_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/lamaduvoma.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3669/files/epic_war_4_hacked.pdf
    • https://cdn.shopify.com/s/files/1/0438/3650/6272/files/nox_app_player_reddit.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_off000057ae.bin
19827b41f939c01023e50d1dcca8550b0e1279a1366a0928baba390f53652203
pdf-font-stream PDF embedded font (sfnt) at offset 0x57AE 5176 bytes
font_01_sfnt_off00006970.bin
4f3e9104df784bce2a37c174b2261a961824a7c877ca95a9e3d6ca69c055033d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6970 14832 bytes