Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f19855c5910633a…

MALICIOUS

PDF

38.0 KB Created: 2020-08-18 22:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356ec17b4d80dceb07d4e1f4a0c21d7b SHA-1: 6b9ebda5d8f518f0a9c765a258c7d19423752fae SHA-256: 0f19855c5910633a6d87a4e465fb8b221c1ba28c8005e6eb2f697b5fcfa72a8f
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 17 external PDF links, with the primary malicious redirector being ttraff.com. The document body, though heavily obfuscated, contains the malicious URL and several other benign-looking PDF links hosted on Shopify. This suggests a phishing or redirection attempt, likely delivered as a spearphishing attachment.

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=science+activity+3+head+on+collision+answers
    • http://files.mammas-amorepasta.com/uploads/1/3/0/8/130874627/besiramo_wadifevive.pdf
    • http://files.palmspringsapplianceservice.com/uploads/1/3/0/7/130776162/164c5cc.pdf
    • http://dagoboj.nwextremeoutfitters.com/uploads/1/3/0/9/130969723/jorodugu.pdf
    • http://piseva.totalfireprotectionsd.com/uploads/1/3/1/3/131383613/dad7eb8f3.pdf
    • http://fimikax.another-bright-idea.com/uploads/1/3/1/4/131452958/dekuseve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/megikori.pdf
    • https://cdn.shopify.com/s/files/1/0440/4353/4486/files/46572877829.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/fowobo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/cantigas_de_amor_e_amigo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/carnatic_music_violin_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/gajulitax.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/dupud.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/facebook_ads_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/for_each_c.pdf
    • https://cdn.shopify.com/s/files/1/0446/9496/2332/files/25_branches_of_biology.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86526592296.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_off00005624.bin
008dc147307b5c8420e3eb90d1f340394cdab7a1c2b8280d5174f7165c925b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5624 5548 bytes
font_01_sfnt_off000068fd.bin
42e3f165ed6d9e9fdd7f88700d24259acc614d5b822b7ed8fba745bcfdb4de57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FD 9964 bytes

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