Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f1d1fe8fd4b9e6…

MALICIOUS

PDF

36.8 KB Created: 2020-09-08 00:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 61146f0d00a53d90d9af89e2fa1e4c40 SHA-1: 29f4a27735ac8198aa116c27f3919e23c294ca4d SHA-256: 41f1d1fe8fd4b9e6de8dbf0a5cb77ca362ae47440c685c46bfd90ef4a0423bba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'free visualizing and verbalizing worksheets' and a URL that appears to be part of a link farm. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a malicious link within the document.

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.me/wix?keyword=free+visualizing+and+verbalizing+worksheets In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0709/9558/files/34278286612.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/2033/2705/files/chlamydia_pneumoniae_traitement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/54453835733.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/121e37_59588302e6d843c2b4a8e1890a6642f7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/270e53_f1718732c4e64049b4477de2c094e758.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/01bc73_c0c5424190c642ab9f30a22918732eb6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/696b8a_d8e4ee83d2274984865d89177f99c554.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_bd3b8e362a2e4060896fd3ae632f73cd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5583/9392/files/june_2019_calendar_printable_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6820/9817/files/genki_workbook_answer_key.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_off000050a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50A7 5448 bytes
SHA-256: 196fcdaed45f84c88b82145b86a98d6b4c9e1c8533d1a992ca5927d3a1ff66a2
font_01_sfnt_off00006344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 10388 bytes
SHA-256: 2930f39dffc58af77289334a1238b5d945ba7b58bf744047a97e21650d975b04

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