Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d97d228d02c4f4…

MALICIOUS

PDF

39.1 KB Created: 2020-08-17 10:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 294c0e0aba3ddc6acea18c51e15fae2b SHA-1: 33345ce3a508ffc74afa075daedb099330cd2912 SHA-256: 08d97d228d02c4f411b74c4039926c2b39cf90537efb8e52ebf980853c33fe78
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/pify?keyword=rowdy+baby+english+songs, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and a large number of other PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=rowdy+baby+english+songs
    • http://feriwupi.temeculatowcompany.com/uploads/1/3/1/0/131071243/zejejo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8062/1984/files/papibibazumezotibameloxoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6390/1334/files/burinaketezovemizikuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/alphabet_v_pics.pdf
    • https://cdn.shopify.com/s/files/1/0440/7630/2486/files/juxajokidajuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1630/files/45844342013.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/adjective_worksheet_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0438/4283/0496/files/49980075064.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/jelosa.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_off00005bef.bin
75630f03d40ad43f1d7269542aa4fd3fc5bcd3f11ee5ee01a6c74fa4a5e86a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEF 5332 bytes
font_01_sfnt_off00006e2a.bin
06c081500bb72afa8e4427274ae1b1f42f80b015273f878d582583f7870291a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2A 9912 bytes

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