Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c3f3211e0bc51f…

MALICIOUS

PDF

46.3 KB Created: 2020-08-04 21:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e74a0da3f45c3c31523fa7899acf6ba4 SHA-1: dc9439eb29a823dd9db3ea55f12ad884630bf804 SHA-256: 51c3f3211e0bc51f17ebbb4d136e08be90021a6ee2eb5de59460f0277ecebbb3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to a known malicious redirector. The document body text, though corrupted, contains the phrase 'Online advertising project pdf' and a URL that matches the redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure via these embedded links.

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=online+advertising+project+pdf
    • http://files.willowfree.ca/uploads/1/3/1/8/131857383/lezifavuxanogoxaja.pdf
    • http://files.aristohomestay.com/uploads/1/3/2/7/132741020/jopiva-susuv-dupaburut-wumig.pdf
    • http://ridege.whsgt.org/uploads/1/3/2/8/132816066/zefeverowijetiraje.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/25782888409.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0862/files/11318764023.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2716/files/60460426090.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/xebomirudalot.pdf
    • https://cdn.shopify.com/s/files/1/0432/1312/7835/files/73396120398.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7192/files/65853964833.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/naxulobev.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/10395963377.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/98974803789.pdf
    • https://cdn.shopify.com/s/files/1/0439/9199/0430/files/tejifuvuwob.pdf
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/dolphin_control_stick_modifier.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6285/files/benoguvixa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0968/files/keravusinuj.pdf
    • https://cdn.shopify.com/s/files/1/0441/3505/5512/files/2475577522.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/mijegomomezobitedewef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067e7.bin
c0ee6d783f5bf67e4169dc5b6c67c4852562bfa0eae3af0aa2bfa6f4b2fc08f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E7 5272 bytes
font_01_sfnt_off000079ef.bin
8329077bd8c41f24613467f18fb428e854f1960e082d921412034238142118ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EF 10624 bytes
font_02_sfnt_off00009dde.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DDE 4324 bytes

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