Malicious PDF — malware analysis report

Static analysis result for SHA-256 1828ee59a28051a7…

MALICIOUS

PDF

42.4 KB Created: 2020-08-07 21:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb61c63333027eb87381db3bf09379f SHA-1: 7d7ea7181aef2091ad1914840a52f345fe6d67ea SHA-256: 1828ee59a28051a7ca060278a15dbb04c59b647d58d0eb4a09e7ccece6683fb5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=jointer+machine+pdf', suggesting a phishing or redirection attempt to external 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.cc/pify?keyword=jointer+machine+pdf
    • http://files.cebuanohomes.com/uploads/1/3/0/8/130814329/nivezasuri-mopuka-sajigivesujegi-folekapus.pdf
    • http://files.upwellings.com/uploads/1/3/1/6/131607174/c3eb020e.pdf
    • http://ritalofun.leiden-united.com/uploads/1/3/1/6/131636725/5264400.pdf
    • http://files.derekcovingtonsmith.com/uploads/1/3/0/7/130738568/bufavijifowir.pdf
    • http://files.gillettehandyman.com/uploads/1/3/1/4/131406434/fupesewujerisap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8286/6083/files/14995865653.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/rubitidigukidufe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0967/files/spelling_test_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/mewevukovugarulexid.pdf
    • https://cdn.shopify.com/s/files/1/0437/4390/3905/files/juselasemobimetolapux.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/mokijevajuxelovafojete.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6645/files/gisubiveretewezuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/sidamogezoxuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8397/2256/files/glossary_of_computer_science_terms.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/84811070263.pdf
    • https://cdn.shopify.com/s/files/1/0431/9418/7933/files/ponisuwarategoxufurugavu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1895/1576/files/john_deere_plow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/97230969069.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_off000069e4.bin
e14bd791b058872a4107b7d8590332aeb622d1f0b9424e6496c835c6821ea262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E4 5176 bytes
font_01_sfnt_off00007b55.bin
823c55420f592b12ed0b6550cc4b449b201a5d245484046160e15eec9514d012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B55 9724 bytes

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