Malicious PDF — malware analysis report

Static analysis result for SHA-256 15348d5afe9319fe…

MALICIOUS

PDF

41.1 KB Created: 2020-08-11 19:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e5b493d992a8206a1e08c8886a1baf2 SHA-1: 55315da411eecd8bebf24bbfb7b1b4a525ed3937 SHA-256: 15348d5afe9319feb5da5b99d2582bddfbda29ff1ea0a133361ff87a2ccc71a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'broncopneumonia infantil pdf' and the malicious URL, suggesting a lure to a malicious site. The presence of a large number of external PDF links indicates a link farm, likely for SEO manipulation or to distribute 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.ru/pify?keyword=broncopneumonia+infantil+pdf
    • http://kemadave.owensdumpservices.com/uploads/1/3/1/3/131381464/9529020.pdf
    • http://files.lisadring.com/uploads/1/3/1/4/131406800/7e75986ec2eba.pdf
    • http://mutenaru.adamsternconductor.com/uploads/1/3/0/7/130776330/2816802.pdf
    • http://sifaxu.recycledcabinetsolutions.com/uploads/1/3/2/6/132680839/7183222.pdf
    • http://lejal.badlyscattered.com/uploads/1/3/1/4/131483281/doxunulo-wukemelorida-vonanuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/79475807000.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5899/files/merriam_webster_dictionary_of_synonyms_and_antonyms.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/53423139606.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2455/files/boone_and_crockett_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/gofirofimotizamogizif.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/gekoxojutuzigomoronodilab.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/carcassi_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/54871958886.pdf
    • https://cdn.shopify.com/s/files/1/0433/2693/1099/files/nhs_pension_opt_out_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/the_thrill_of_the_chase_a_memoir.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/accounting_cycle_steps_with_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/46247422371.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/jimilipiwavum.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_off00006415.bin
4038c9106308a156a639c6035d27d7101dccbbe9d2ca9d081931429af646c037		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6415 5172 bytes
font_01_sfnt_off0000758d.bin
816074477e23ae300254ea91929a465608f7cc6ddce876dc18eb0c07d8ebfde9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 10068 bytes

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