Malicious PDF — malware analysis report

Static analysis result for SHA-256 7929245c8c40bb0c…

MALICIOUS

PDF

90.9 KB Created: 2020-08-29 19:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97894c6af068dfa5e60659f5e8053913 SHA-1: f66affc29d4f16d0a07a1e41a99285386685ae56 SHA-256: 7929245c8c40bb0ca0ec197c3103346a79109fda9c6b86ff2f2270c941abf1df
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector URL associated with malicious activity. The document body, though heavily obfuscated, contains text related to exercises and a URL that mirrors the malicious redirector. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a link farm designed to drive traffic to malicious sites.

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/wix?keyword=ejercicios+resueltos+sobre+presupues
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/midbrain_syndromes.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/pawubedopozebabukele.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/social_network_template_app_ios_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6023/files/masojufibaseneto.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/setusepiregavabafilemuno.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/14798004948.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/248138192.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0429/3319/0823/files/wedugilavarijesosomob.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/53946469384.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/22107588074.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/95354214678.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8849/files/2521085080.pdf
    • https://static.usrfiles.com/ugd/83e24f_a4c8e17c204f4d578b858f96f09264cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd09c383339a480bb46b21b5c0a4a224.pdf
    • https://static.usrfiles.com/ugd/b8c837_b06a2d3d25fc4f509533f5b8e18b48a4.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_off000124a4.bin
25cefbf71fb35378b4b4ccabc70b47d67ef0a9dbe64ac60a4e41709d7e06cac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 4888 bytes
font_01_sfnt_off00013556.bin
2020dd2c0baf5d4541e7daf63327cc3e864792e96e8283b1aca9c9e038e2e7f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13556 12148 bytes

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