Malicious PDF — malware analysis report

Static analysis result for SHA-256 deca8f757276ed6f…

MALICIOUS

PDF

35.7 KB Created: 2020-08-11 00:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 376204cefddbf88500fb7e7b7108493a SHA-1: 2f82e8a68cfa717b14a70affb7c185372f82b8a1 SHA-256: deca8f757276ed6f1d045d1e82ff0d487d6cec8f819e639fefaa5f3765961d16
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spam operation. One of the primary links redirects to a malicious URL, indicating a potential malware distribution or phishing attempt. The document body, though heavily obfuscated, contains the same malicious redirector URL and references to PDF files, reinforcing the lure.

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=oxford+word+skills+intermediate+pdf+chomikuj In PDF document text
    • http://files.inqyr.org/uploads/1/3/1/6/131607407/05935.pdfIn PDF document text
    • http://files.marcelkerkhoff.com/uploads/1/3/1/4/131436967/gulozoboruxi.pdfIn PDF document text
    • http://files.puppiesfromabove.com/uploads/1/3/1/3/131397946/aeb9e92e1c8a.pdfIn PDF document text
    • http://files.kiarakzelcreations.com/uploads/1/3/1/6/131606362/ee2811d.pdfIn PDF document text
    • http://files.makingmontevallo.com/uploads/1/3/0/7/130740458/86bb53dfde4e6e.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/1/0432/8233/3856/files/migafopurab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/7750174329.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/37982494591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/3758/5571/files/uninstall_covenant_eyes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/87251015102.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/tefikojumexukijisafulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/dobemudelafubajifubir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/55910438398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5089/2454/files/xanarofejaka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/mejebofowuwefaguzutopunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/9604/3674/files/cover_letter_in_spanish.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0911/2226/files/49187978729.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D70 5724 bytes
SHA-256: 2b2f48cb8b868cac388cc8990112553d4a179a99284c04479758fcfb2b5beae3
font_01_sfnt_off000060d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D8 9568 bytes
SHA-256: ed702e869e6dcbe351d000b97b7b8da64339bbfe306bdeda220b11b75b1caf90

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