Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b53046ecbfd0a3…

MALICIOUS

PDF

54.9 KB Created: 2020-08-09 23:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef1cbbc3e1352d11a555b48750cafaa8 SHA-1: 6c770f83510a37b35d9ceba4cfe9c9a1a5443b23 SHA-256: b5b53046ecbfd0a32296a4937c23622d2be026b5133b8bfbe610ca7a707bd195
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document was flagged by multiple critical heuristics as a malicious redirector and link farm. The primary malicious indicator is the embedded URL 'https://ttraff.cc/pify?keyword=chomsky+aspects+of+the+theory+of+syntax+pdf', which is known to lead to malicious infrastructure. The document also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure the final malicious destination. No scripts were extracted, but the presence of a malicious redirector is sufficient to classify the attack pattern.

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.cc/pify?keyword=chomsky+aspects+of+the+theory+of+syntax+pdf
    • http://files.loblowsports.com/uploads/1/3/2/6/132681885/31de8.pdf
    • http://files.markrheadassociates.com/uploads/1/3/0/8/130814439/6605395.pdf
    • http://fovokeni.thesoloagency.com/uploads/1/3/2/6/132681352/b80fce.pdf
    • http://lepib.pastorguy.org/uploads/1/3/0/9/130969723/4f1bced57573.pdf
    • http://xejijo.angelajullings.com/uploads/1/3/0/8/130874655/mupenetesadekab.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/36397929780.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/zowegugeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/naval_architecture_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/55364399747.pdf
    • https://cdn.shopify.com/s/files/1/0435/9526/8264/files/ecocardiograma_pediatrico.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2386/files/wegoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/xesupux.pdf
    • https://cdn.shopify.com/s/files/1/0430/8864/2197/files/pozek.pdf
    • https://cdn.shopify.com/s/files/1/0432/0916/2907/files/37367159411.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/sedentary_lifestyle_and_obesity.pdf
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/kotaweveximiga.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/74189069013.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/17529439611.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97503793953.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_off00009937.bin
ba7cf7ad76971020621a40bb9afcb8865f5a9aa8db4c33fcd0631e84d48991a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9937 5500 bytes
font_01_sfnt_off0000abcb.bin
a9476239ae9258cce48cc2ce46278b30dce51c7a33b5773474600e80a9f29255		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABCB 10032 bytes

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