Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5fedc7a643f8b5…

MALICIOUS

PDF

33.5 KB Created: 2020-08-10 19:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b16dcf8b4a3f9d1a0abdee2b51be6703 SHA-1: f5262880a56587133993e212b52a2bc9472d3216 SHA-256: 5b5fedc7a643f8b5b062c05dde3b6a5207b2d8e923c7472697b51b5794c7f3bc
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which in turn points to a large number of other PDF files, suggesting a link farm or download lure. The document body itself contains the primary malicious URL and references a 'free download' for religious texts, indicating a social engineering pretext. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bukhari+sharif+in+urdu+hadees+full+pdf+free+download
    • http://files.urbanhindu.com/uploads/1/3/0/7/130738943/milovo_filerapemebur_nejimojilomik_wuzebasozodanuf.pdf
    • http://files.junkim666.com/uploads/1/3/1/8/131856318/davude_wuxuzokimilu_pepuwovad.pdf
    • http://files.ecirunner.com/uploads/1/3/1/4/131452904/16333f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/letowopebofowebizuwir.pdf
    • https://cdn.shopify.com/s/files/1/0430/3149/4810/files/gobabuwedoras.pdf
    • https://cdn.shopify.com/s/files/1/0432/3927/6707/files/wii_iso_torrents.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/convert_file_to_word_free_trial.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/49460004726.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7297/files/kijafafek.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/wow_classic_salt_shaker.pdf
    • https://cdn.shopify.com/s/files/1/0439/2812/5595/files/bedumitimutajorimi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/dd_form_2278.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7305/files/essentials_of_biostatistics_in_public_health_lisa_sullivan.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/82509202476.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/jinaxapesufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/duketuzabibuvagozapeveda.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_off0000470c.bin
417d0327ab0cd513812732027fd498f38ebba8ae5ef263b408079e2addd1da15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x470C 5336 bytes
font_01_sfnt_off0000593b.bin
37c3ee63d129fb7918bffd3e3193e21f2d3383e7b4211fbcc8682f0af3471d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x593B 9256 bytes

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