Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b498c0d7271984e…

MALICIOUS

PDF

47.9 KB Created: 2020-08-21 13:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad59a59977293417a6057f2a994788fb SHA-1: 3fe49dc42a48a743b89a61309952df7f3e1e8fa2 SHA-256: 5b498c0d7271984e90c100bfe58f5d10b50bcba51d5b68422e2efcaa11129334
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector service. The document body text and embedded links suggest a lure for users searching for 'top self help books pdf', directing them to potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains numerous external links, indicating a link farm or redirection scheme.

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=top+self+help+books+pdf
    • http://files.shareslog.com/uploads/1/3/1/3/131381288/1148203.pdf
    • http://files.unitedfacemasks.com/uploads/1/3/0/7/130740401/xejamuwev-dunewuj-sovolakib.pdf
    • http://dilajir.theravenreview.org/uploads/1/3/0/7/130738970/ed56af69.pdf
    • http://files.marriagecounselingindenver.com/uploads/1/3/1/6/131637257/satapelexodajeful.pdf
    • http://zozulo.warmnightcandles.com/uploads/1/3/1/6/131637881/golegumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16216600544.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/pdf_splitter_and_merger_free_download_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1958/2110/files/19968562182.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/xepudupodibowovesov.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/49193735816.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1277/files/autocad_mep_2014_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/nadetubolawabuwagemiwos.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/apk_coc_fhx_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/4687735959.pdf
    • https://cdn.shopify.com/s/files/1/0452/9192/9761/files/persuasive_writing_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/kakuxiwedun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5207/files/joe_pass_ain_t_misbehavin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072f8.bin
2e5522184a81be59f45945fa89961a9831fcd47c227387966f975fcfc12ccbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F8 4976 bytes
font_01_sfnt_off000083d7.bin
4ae8fac4ab76fd2f0cc73f0125a8dac720b8ba70953040776cd8a8b9a4729da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D7 2444 bytes
font_02_sfnt_off00008d7e.bin
fef8761722f8d5b4e731808eb4c756c1fe008f75505876c4f5fc8af8d62d72f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7E 10280 bytes

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