Malicious PDF — malware analysis report

Static analysis result for SHA-256 350c08d6f345a553…

MALICIOUS

PDF

40.4 KB Created: 2020-08-02 21:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d838fdf966ea6d89134f402cb676d70c SHA-1: dde2ee0b478de17a13040a037b4ee42ec9bb432f SHA-256: 350c08d6f345a5536770ee994fea819a833c81a38a0c0c0d0a19f3bce7bf0c22
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links. The document body contains obfuscated text and embedded URLs, including the malicious redirector and a link to a Shopify-hosted PDF.

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=comma+code+python
    • http://files.nutmeg-labradoodles.com/uploads/1/3/1/4/131483281/5493668.pdf
    • http://files.dendaledairygoats.com/uploads/1/3/1/4/131438528/masode.pdf
    • http://files.kschnallart.com/uploads/1/3/2/7/132740277/fufajanevod.pdf
    • http://files.adoxian.com/uploads/1/3/1/4/131406086/nolirereweto-zujodatosamono.pdf
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/wekitonizomudusojunogete.pdf
    • https://cdn.shopify.com/s/files/1/0434/7530/4612/files/red_cross_instructors_corner.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/68240864395.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/puziniziwemafadisovo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9691/4586/files/65407481183.pdf
    • https://cdn.shopify.com/s/files/1/0434/7379/7285/files/71880338027.pdf
    • https://cdn.shopify.com/s/files/1/0436/6496/5782/files/11919831879.pdf
    • https://cdn.shopify.com/s/files/1/0429/5298/2684/files/78483836292.pdf
    • https://cdn.shopify.com/s/files/1/0432/1801/0274/files/ca_dmv_dl_44.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3637/files/34214233636.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5050/files/ingersoll_rand_compressor_parts.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/46926033001.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_off00006077.bin
67280c5ad1c6ca22dcc2ea073eb10a6402b9e696efcd6868df79dd90d9c94db7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6077 5016 bytes
font_01_sfnt_off00007167.bin
5a606b87a9986b5c672da4079e461935456f82e887c3c1d8ad91d5747768db60
pdf-font-stream PDF embedded font (sfnt) at offset 0x7167 10532 bytes