Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d50e4f81651925…

MALICIOUS

PDF

53.9 KB Created: 2020-08-15 05:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bf238259f1cb9938b77a0a260b874bf2 SHA-1: b9b666727a8ee345898e5a1b5dee99b12150f6af SHA-256: 57d50e4f8165192529a81c9197e9b034ded748ae5d701ec5205103cb86eb4ed0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL is https://ttraff.ru/pify?keyword=civ+6+rise+and+fall+germany+guide, which is flagged as malicious. The document body, though heavily obfuscated, contains references to game guides, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=civ+6+rise+and+fall+germany+guide In PDF document text
    • http://gesijido.chloejmkim.com/uploads/1/3/0/7/130740146/841681.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/1/0432/2358/0830/files/86076638803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0911/3253/files/lapegizuzodudalo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0911/3253/files/integration_formula_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/fotutikapojegajiwug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/regizidizijedasizupinafof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/xureresenasomofivuxukoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4441/3350/files/99396332253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8841/8718/files/46201137678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/denexoxewiranofelulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2908/6876/files/29963717351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/38173626196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/dell_poweredge_r440_server.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_off00007458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7458 5448 bytes
SHA-256: 38328e39aa0e70b0a9c460456ecfee73af1e1e8c1c6793bea0faebc8c5c6482d
font_01_sfnt_off000086cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86CF 14568 bytes
SHA-256: 5ac14600833a7279e69a16a9e7b35fe1dd349ba46f63d130bf7d44e321fc57ef
font_02_sfnt_off0000b523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB523 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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