Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cc00701119c536…

MALICIOUS

PDF

62.7 KB Created: 2020-08-07 04:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afc002ef0ccb12c9d8e01de894ab46a8 SHA-1: 26d5534aad23f7568184ad7aa64e3a0795983d8f SHA-256: 71cc00701119c536aa9112dee3ce3962d48e93999eb68152fdffea8e4f3e903d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate an attempt to direct users to harmful content. The ML classifier also flagged this PDF with high confidence, supporting the malicious classification.

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=comparison+advanced+exercises+pdf In PDF document text
    • http://files.cascadegriffs.com/uploads/1/3/1/8/131857920/a50e90d.pdfIn PDF document text
    • http://files.samschaus.com/uploads/1/3/2/7/132740457/5eeb85.pdfIn PDF document text
    • http://files.antonthomasart.com/uploads/1/3/0/7/130740513/gukuxukum-balosis-kakiranofuxovag-xedudekopika.pdfIn PDF document text
    • http://files.chambersinsurance.org/uploads/1/3/0/8/130813054/zogulil-zasobajana.pdfIn PDF document text
    • http://files.ericaveryartist.com/uploads/1/3/0/7/130775867/jedaxixabaxeza-kubazo-xikoz-fegonetazowuseg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/wedding_cake_recipes_pdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/97518960800.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/essential_words_for_the_toefl_4th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/nadogeruseponegafabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9258/1288/files/seguvomo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/wudezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0506/6907/files/332618928.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/repabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/wuwumukilubemitolamoxosu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/dibodunef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/38873778987.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4583/7208/files/27292189436.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a1eb.bin
08094942c7d818f6fc2cde9f923a84f5e1efb32373e3f02f5d9272b2364f7706		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1EB 5300 bytes
font_01_sfnt_off0000b3de.bin
5f27a10d2d5524d86cb9e4e22c6416d243dcf9fd12955f5d96fdd7b134e9ec99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 10692 bytes
font_02_sfnt_off0000d8a8.bin
5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16140 bytes

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