Malicious PDF — malware analysis report

Static analysis result for SHA-256 1852c8a742c189c7…

MALICIOUS

PDF

50.2 KB Created: 2020-08-09 05:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b59d0811fbd815ab20fcf28d07f8df2c SHA-1: fa1d1390a825ce974cdc462082f415bf9c2d077a SHA-256: 1852c8a742c189c752b68e166a5c0b5122053a73162a59a309397043b9cddeff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to Shopify domains hosting seemingly benign PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO manipulation tactic to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the redirector link are strong indicators of a malicious intent to lead users to harmful 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.com/pify?keyword=accidente+vascular+isquemico+pdf
    • http://saguvubi.tfguillen.com/uploads/1/3/2/6/132682883/7853069.pdf
    • http://files.denny-divinelanguage.com/uploads/1/3/0/8/130813747/1a08f6e54694c3.pdf
    • http://files.felicitasdoula.com/uploads/1/3/1/6/131606537/vazez-pexajano-sagotegojof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4406/0839/files/application_of_genetic_engineering_in_health.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9395/files/sovenuzepedilelizotij.pdf
    • https://cdn.shopify.com/s/files/1/0432/1987/8048/files/learn_javascript_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/74316563309.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/complications_of_meconium_aspiration_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3811/files/31221035998.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/sitemibamo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/14537747450.pdf
    • https://cdn.shopify.com/s/files/1/0436/9298/2427/files/us_history_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/91578949750.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/active_passive_voice_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/1197/9939/files/cengage_unlimited_subscription_1_term.pdf
    • https://cdn.shopify.com/s/files/1/0429/6713/8470/files/62106346472.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_off0000801a.bin
05cd90f0ac6a61398b569aa24b1adc7bbe0f05871f9ca482d0cc16120d90abff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801A 5476 bytes
font_01_sfnt_off000092ab.bin
0f0bc008ca6bb19b39da4d7236fb891e4f4480bee5d4d671a0b2c35554992e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AB 12788 bytes

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