Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f42872a0e9f3fb4…

MALICIOUS

PDF

169.4 KB Created: 2020-08-14 11:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f18675cf9fb03131cd51dc0dc3e638b SHA-1: a79a45fa7525798cf42f6925ae85bf1eb1bf3506 SHA-256: 0f42872a0e9f3fb49d78abedba1cd63b868151b219aaba73af3721f304d923ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure related to a "Microsoft c language reference pdf" and embeds a URL that redirects to malicious infrastructure. This suggests an attempt to trick the user into visiting a compromised site, likely for further exploitation or credential harvesting. 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/wb?keyword=microsoft%20c%20language%20reference%20pdf
    • http://files.tianabridalcollections.com/uploads/1/3/2/7/132741241/88c1dc6.pdf
    • http://bibozob.jenniferannestone.com/uploads/1/3/0/7/130739626/xesig_vemolibefigil_difijasejipere_pibeganunirone.pdf
    • http://files.synergybc.com/uploads/1/3/2/6/132696263/6729554.pdf
    • http://gewovo.jimsalvucci.com/uploads/1/3/2/6/132682694/41736.pdf
    • http://revixip.soaperswithoutborders.org/uploads/1/3/0/7/130776779/gevuzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/weight_loss_goal_chart_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/5076/0357/files/microsoft_word_invoice_template_australia.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/26630857316.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/fivutaxazonibezarez.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/bunelovowenoxomave.pdf
    • https://cdn.shopify.com/s/files/1/0429/2893/0979/files/baldur_s_gate_descent_into_avernus_download_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/faxusumowavunisipor.pdf
    • https://cdn.shopify.com/s/files/1/0437/6467/8817/files/7439871968.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/12359174798.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/12423229241.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/50318776722.pdf
    • https://cdn.shopify.com/s/files/1/0435/8914/0643/files/academic_phrasebank_navigable.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8514/files/gugawagidomoletamune.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/acca_f6.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_off00024d88.bin
68cd19094f3c5f3fc77c1c5f69c84fb8f5b9ed6b680ecdbafd93001aba0bc63f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24D88 5328 bytes
font_01_sfnt_off00025fb3.bin
f9541b5ff981264555f0ce84e79c55f55c05a8def9079025023d81871f8d47fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25FB3 18008 bytes

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