Malicious PDF — malware analysis report

Static analysis result for SHA-256 849c736219ad3ea8…

MALICIOUS

PDF

35.6 KB Created: 2020-09-03 08:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ba439143915aba71d75955cf074bec9 SHA-1: 51df94cce1e47b8a1bc06c29cca96368b29b5405 SHA-256: 849c736219ad3ea84e597b542a7b151c543a7b2e472c82377a2209f2daf41020
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same URL. This suggests an attempt to direct 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.link/wix?keyword=conjunctions+exercises+for+class+3+with+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/1ee69b_64caddb6d1d14a3797d22c1637a9e2ed.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/451a43_1e36187218c8417098c6a510e6d41d50.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/55f640_3af00a66f9704b1baf9d9174195966ed.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cbdbb6_a0402517479b434ba6f45a43be30466c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f6a907_9008fc4213f04eb29f44504fe71984e7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6cf392_9330c0c4d114405ab9f604919baf3c01.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/52b593_5054b77ad74f4febb6056ef5f5cadc6a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3e5d97_76ba596fc2124b47bfca512476073832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8062/0955/files/cambridge_english_prepare_level_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8670/8889/files/womibogekaladofupi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5016/2583/files/newborn_assessment_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/8301/7895/files/adjusted_odds_ratio.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d7f.bin
bb55e24f5636e8ac29ec2325c8da343835e1c78b18f42a0d634144f03bcc447e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D7F 5276 bytes
font_01_sfnt_off00005f7e.bin
cf04f3a9f6f570f6269ca86b5796303ef3f044a009893c6b5859f688b7d43984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7E 9884 bytes

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