Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48e6c80121fc5b7…

MALICIOUS

PDF

45.7 KB Created: 2020-08-05 04:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4ec6643a731849aeb42e20fbf5012d9 SHA-1: 5805a8b5222e1452d5a1a2565cb55931910c9406 SHA-256: b48e6c80121fc5b743391776db8099c9d502b5c93984d9866f964fe894c6f2d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a link to a children's story collection. The ML classifier strongly indicated maliciousness, and the PDF structure includes a large number of external links, suggesting a link farm or SEO poisoning attempt. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=racconti+brevi+per+ragazzi+pdf
    • http://files.valriejensen.com/uploads/1/3/0/8/130874189/mobupikib_nizijilikojipam_gasov_vimibamezesado.pdf
    • http://files.newreach.com/uploads/1/3/0/8/130813906/2bfa425328f7401.pdf
    • http://files.rbvonline.com/uploads/1/3/1/3/131384127/5545273.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0444/7302/4679/files/hygromanteia_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/nekisu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0981/8272/files/muwefetok.pdf
    • https://cdn.shopify.com/s/files/1/0432/9344/2208/files/55787259218.pdf
    • https://cdn.shopify.com/s/files/1/0440/2036/7510/files/zagawaziripabakirokosig.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/voicemeeter_vs_banana.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/sozimifugematusofagafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/18811456725.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/netbeans_java_gui_builder_tutorial_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/xozopibutepimumewezu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9376/7832/files/worked_problems_in_ophthalmic_lenses.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/8.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/another_word_for_equal.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/
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/xozop

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000706c.bin
a692d81ea2b06eee9507a7154f453014f75c1ed4917553f7381309c276ecb55e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706C 5372 bytes
font_01_sfnt_off000082d4.bin
00c8c8f97f08d9b160f3548689c117e5418645c5b53d04159f24ecfd5771e12a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D4 12200 bytes

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