Malicious PDF — malware analysis report

Static analysis result for SHA-256 241a0c7f414814d5…

MALICIOUS

PDF

112.2 KB Created: 2020-08-05 00:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc33b7e006dc8b618818145def6c6eba SHA-1: fb27c8aace669cb3d67b9c87fece4a7d7c5e4cd8 SHA-256: 241a0c7f414814d514efa3871ae1b280fc4db82592a34bab1ef40f2954d2d913
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=que+es+un+estudio+de+mercado+libros+pdf'. Another critical heuristic indicated a PDF link farm, with many links pointing to Shopify domains hosting PDF files. The document body itself is largely unreadable, but the presence of these links suggests a lure or redirection mechanism.

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=que+es+un+estudio+de+mercado+libros+pdf
    • http://files.crowsnestpassmusicfestival.com/uploads/1/3/2/7/132740399/bifuzefubunu-nepoto-rokiwoje-riwuguf.pdf
    • http://files.avhscoreacademy.com/uploads/1/3/1/8/131858044/xotofolexusafe.pdf
    • http://files.brskl.com/uploads/1/3/2/6/132695629/jonuvetawanisir-forupawanebuna.pdf
    • http://wuxoxeze.chesterfieldelementarypta.com/uploads/1/3/1/8/131871864/kujefodijagidugopin.pdf
    • http://files.thehutchgroup.net/uploads/1/3/0/7/130738696/zazakika.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/48766291383.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/bbg_program.pdf
    • https://cdn.shopify.com/s/files/1/0436/7699/1653/files/kuxuwotofumelojejokale.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sozolomunegodufedawugiwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6888/files/68380678778.pdf
    • https://cdn.shopify.com/s/files/1/0429/7913/1551/files/fojigiresumubegodakagixij.pdf
    • https://cdn.shopify.com/s/files/1/0431/2648/9249/files/dasezufexesol.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/mozipasivowowadesorugije.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/selegirogokuwusopif.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/3857094201.pdf
    • https://cdn.shopify.com/s/files/1/0438/2100/7005/files/secret_of_mana_rom.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017847.bin
1b304880e6e5b21a5539fce20070c2008a609d437219a034d67ffbc8499f3140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17847 5504 bytes
font_01_sfnt_off00018adc.bin
20ddd64d738575edc19357a945f2f2eb2ac7b6ad4ca5d27db298c1b87a6a2260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADC 12452 bytes

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