Malicious PDF — malware analysis report

Static analysis result for SHA-256 7290fa0409defd98…

MALICIOUS

PDF

39.1 KB Created: 2020-08-13 03:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d0484cef742fd4f28ef1118b94f02c3 SHA-1: 7660da0893a209626f82c37124ab351bf5ef0b75 SHA-256: 7290fa0409defd9856699ea302e7411ed622574975c0397f30cb34f09e994c26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to potentially malicious redirector infrastructure. The document body and metadata suggest a lure related to 'Microsoft word use pdf', aiming to drive traffic to external sites. While no scripts were extracted, the extensive link farm and the presence of a malicious redirector URL indicate a campaign to lead users to harmful content.

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/wb?keyword=microsoft%20word%20use%20pdf
    • http://wewuxulo.conleyxc.org/uploads/1/3/1/4/131437462/8bee11ad.pdf
    • http://files.4mustain.com/uploads/1/3/1/3/131381706/3411411.pdf
    • http://files.tjeducationalleader.com/uploads/1/3/1/4/131483138/1a5b7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2480/8096/files/xupopokiwaxezil.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/22125436990.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/mac_gba_emulators.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/fugoxaxetajuligokenur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/raspberry_pi_zero_otg.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/a_twist_of_the_wrist_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/tidolilesabupiwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6731/files/joint_probability_density_function_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/4072/6427/files/facebook_code_generator.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/hamartome_mammaire.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/53000536415.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/aswath_damodaran_corporate_finance_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/rubowuzasela.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_off00005d70.bin
154197d91d900f6725902e05719db99057c2aae37a906a3ab19c071c68a231f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D70 5004 bytes
font_01_sfnt_off00006e98.bin
1bc6f379e126d197a9f5d61d56df1e7665762e4848481f9faddc6cd1e951bfa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E98 9704 bytes

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