Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a82861a111d457…

MALICIOUS

PDF

46.0 KB Created: 2020-08-20 04:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e68aaf0bdf77f8fa0ca862978eb8b169 SHA-1: c208f2a8b286acf97b5b5e8020189f5eacc76501 SHA-256: b9a82861a111d45793b31030392c3174bdbadbf9019a9194c15b4c7b8a88e831
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=food+in+ancient+egypt+pdf', which is a critical finding. This indicates the document's purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this 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.cc/pify?keyword=food+in+ancient+egypt+pdf
    • http://jomosiru.kyliefitzpatrick.net/uploads/1/3/1/4/131483400/zafefer.pdf
    • http://files.tedxparkcity.org/uploads/1/3/1/8/131857544/napekizi-getubi-wijavomelonuna.pdf
    • http://files.thewizardsmessage.com/uploads/1/3/0/9/130969701/6169144.pdf
    • http://lavavuze.solarpumpindia.net/uploads/1/3/2/8/132814930/befezamawa_vapig_mubepomepesaxit.pdf
    • http://files.laguminalaw.com/uploads/1/3/1/4/131411474/4d7026da6.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/feluzowu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/vosetajot.pdf
    • https://cdn.shopify.com/s/files/1/0448/4120/5917/files/mobuveroworunufog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/implicature_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/11204239826.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/16710512406.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/solidworks_2015_keygen.pdf
    • https://cdn.shopify.com/s/files/1/0434/8477/4552/files/87142172155.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/nalarizoparoxopopaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/perspectiva_isometrica_caballera_y_militar.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9048/files/unitech_cable_tray_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/engage_8100_datasheet.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_off00007661.bin
824daa33e4bca418e72a7e8b25f176f7d5e757f97280d88eafc2d19e825a9531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7661 5072 bytes
font_01_sfnt_off000087cf.bin
5fd28dfcb036f0e6e9ef941c724dbb16892533b576a02f1da3b5ca7d890a703e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87CF 10372 bytes

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