Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ac4f765a12d597…

MALICIOUS

PDF

41.1 KB Created: 2020-08-20 04:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc955a55663d4560ddafb1053f03a90a SHA-1: ef6e9bfa9b6e6e611df2c2e262fdd952fa105095 SHA-256: 18ac4f765a12d597e6ad0c70c75616e5a131b55699353c076d74ada928a14eee
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 what appears to be a link farm designed for SEO manipulation. One prominent link directs to a known malicious redirector, suggesting an attempt to lead the user to harmful content. The document body, though partially corrupted, includes the URL for the malicious redirector and mentions 'children's birthday invitations templates for free', indicating a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious redirection attack.

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.ru/pify?keyword=children%2527+s+birthday+invitations+templates+for+free
    • http://files.trifexy.com/uploads/1/3/1/4/131437276/zuzuzise.pdf
    • http://files.bigcreekbulldogs.com/uploads/1/3/0/7/130775431/vexepivujesu.pdf
    • http://ziwuviwat.thenchtuk.org/uploads/1/3/0/7/130776445/3529956.pdf
    • http://jizuvage.holmescreekbc.com/uploads/1/3/0/8/130813821/2d45fff24.pdf
    • http://kizori.wrightonlakemeredith.com/uploads/1/3/1/6/131606598/6838a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1514/3587/files/mebevoruvape.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/cloud_reader_kindle.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/volinuja.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/94087249311.pdf
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/54068397777.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4087/files/55515564119.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/sepixebifoxabixefepebo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/tesip.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/subject_verb_agreement_ks2_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2982/2631/files/html_progress_bar.pdf
    • https://cdn.shopify.com/s/files/1/0432/8688/8612/files/bikos.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/resume_cover_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/76979435521.pdf
    • https://cdn.shopify.com/s/files/1/0447/7698/0629/files/jesebupisavelagigijata.pdf
    • https://cdn.shopify.com/s/files/1/0437/1342/9655/files/cedula_rfc.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_off00005b8f.bin
81f19572b0dafe50685dfadbeeb3ef918256dc8b9a3fdda0bbc3c307fde4c7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8F 5524 bytes
font_01_sfnt_off00006e28.bin
139a9f6183b2a9e105f9575fc553ad1298e53cdce232d03cb4738573b379bb38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E28 13096 bytes

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