Malicious PDF — malware analysis report

Static analysis result for SHA-256 140d115253072024…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 12:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c23b0dc96f63700ab79dd1fbaf0f1ac3 SHA-1: 5a16dfc0ba15695a2b1c49ebeae1581686ff4e99 SHA-256: 140d1152530720248130b0ff83d04996fac3ed2718618158f035f016f4bb3a2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'the adventures of huckleberry finn reading guide' and the wkhtmltopdf application, suggesting a lure. The presence of numerous external links, many pointing to user-uploaded content, further supports a link farm or redirection scheme.

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.ru/wix?keyword=the+adventures+of+huckleberry+finn+reading+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6694744333924d179f20ebd4164a7612.pdf
    • https://static.usrfiles.com/ugd/b8c837_20112825a67444488be804422d35c2d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dab864b09424ea39e6afd3326ba8111.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a016298cd264e08830d91a2ceb502ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e89944775ce4cac9cbbc9645d74763d.pdf
    • https://cdn.shopify.com/s/files/1/0431/7626/3841/files/jazop.pdf
    • https://cdn.shopify.com/s/files/1/0432/1617/5263/files/poditabinakonemanuzu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5749/4693/files/hit_that_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0441/0654/7352/files/plague_inc_premium_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/application_of_computer_pharmacy.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/juguwexibetojedod.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8918/files/voxukozinowosa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/guwinux.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/family_guy_saeson_6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a89861ec2d0148a5bc7c1a34fe376d43.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2313994f7914533a74b990a212e84c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f50b206fa1be453daddc425694672898.pdf
    • https://static.usrfiles.com/ugd/b8c837_6065188ab8e34fb9ba84f9bcf177a299.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_off00006201.bin
38c2f6acca3c848f588e051a0060461d6b025f8bb3527130d7c99249be28b5e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6201 5596 bytes
font_01_sfnt_off0000750d.bin
d714542f3d56d05816a5d6836e0fd5481e6cbae0342343c591baa36a9d3f3f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750D 10192 bytes

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