Malicious PDF — malware analysis report

Static analysis result for SHA-256 714a87160e781ec4…

MALICIOUS

PDF

75.8 KB Created: 2020-08-03 19:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d16d80076d398733096437b13ca1807 SHA-1: 57c4d57c9c899e516d670b3e91ecb7f9d5bbe181 SHA-256: 714a87160e781ec488f5d909df493d35f1d1a41af657cacee83c41e8b1b231d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that lead to a redirector, which is a common tactic for distributing malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure for a free PDF download, likely leading to further malicious activity.

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=java+programming+bangla+book+pdf+free+download
    • http://files.shakesreview.com/uploads/1/3/0/7/130776312/2434715.pdf
    • http://files.bargeattitanic.com/uploads/1/3/1/8/131872015/6596266.pdf
    • http://files.mightymicrobuilt.com/uploads/1/3/2/8/132815008/nalelijefiduwuk.pdf
    • http://files.silvabuilt.com/uploads/1/3/0/7/130775515/ruzesobiwep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/jovorurog.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/22963634507.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/84166354417.pdf
    • https://cdn.shopify.com/s/files/1/0439/8658/3710/files/28838680524.pdf
    • https://cdn.shopify.com/s/files/1/0431/9382/7485/files/33808586211.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/army_builder_40k.pdf
    • https://cdn.shopify.com/s/files/1/0430/4198/0567/files/82939385399.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/35479602600.pdf
    • https://cdn.shopify.com/s/files/1/0429/3168/3484/files/konanonegalajoruteriwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3683/5993/files/minecraft_death_screen.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/85224370088.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c042.bin
cbb96ebfdaed96024ee6a70ef0597d85e533b6b4e3d43cd8d624337893e042d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC042 5236 bytes
font_01_sfnt_off0000d1fc.bin
74154886c4beea006621f3582e26218d787b5fbc5bb8c0d41caa1a0db6152ec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 3948 bytes
font_02_sfnt_off0000de3d.bin
83c57b569975d900ff3ef6d7a7506801eb9027d38b1d29bbd906c09309ff1b37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 17176 bytes
font_03_sfnt_off0001130d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 4324 bytes

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