Malicious PDF — malware analysis report

Static analysis result for SHA-256 00dbcdacacfafcc0…

MALICIOUS

PDF

46.5 KB Created: 2020-08-08 22:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a27a766d8870223d99155387f3225904 SHA-1: f2c4e53cae17e6569ad172a0dee8bcc0f6649aa8 SHA-256: 00dbcdacacfafcc063fb074c202df0f0ee886b95ca993058f17626583c5538de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to disguise malicious links within seemingly legitimate document content. The primary IOC is the redirector URL used to obscure the final destination.

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=nominal+ordinal+interval+and+ratio+scale+pdf
    • http://files.therexburgerandlobster.com/uploads/1/3/1/3/131379439/be60fb09.pdf
    • http://files.lotusandthewildflower.ca/uploads/1/3/2/8/132814306/vebegokedofogu_xiramimepemova_kuguga_bolekuvur.pdf
    • http://bumitu.italianstringsacademy.com/uploads/1/3/0/7/130740072/7386811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7287/9773/files/vlookup_function_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0439/6518/6206/files/babida.pdf
    • https://cdn.shopify.com/s/files/1/0428/1879/7724/files/43880583034.pdf
    • https://cdn.shopify.com/s/files/1/0449/2728/7451/files/platformio_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/zaxazaropaludanoxox.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/xuganifavutasegediwazawas.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2634/files/89260966673.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/ab_initio_training_material.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/miximura.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/44759747141.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1520/files/72381365763.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.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_off000077e3.bin
ac309dcc71b62dfa9c42efad7776cb563809eb14914691bfe86d5aa2a12bfe26
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E3 5332 bytes
font_01_sfnt_off000089f7.bin
d31454071779db2c57434d6cd0b4066660dcc584887c421c0e1c094006b3c174
pdf-font-stream PDF embedded font (sfnt) at offset 0x89F7 10316 bytes