Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33b348ee1eed336…

MALICIOUS

PDF

50.1 KB Created: 2020-08-21 05:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de1dda344a879b9f5d34fc9db5222e38 SHA-1: f366ff1402b501f1a2c229242826b0f7ceb7e187 SHA-256: c33b348ee1eed336a393bd65cd496d8e97bee090ef326bb9f41764abd8b4b461
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=diana+build+guide+s9'. This URL is presented within the document body, disguised as a 'Diana build guide s9'. The document also features a PDF link farm heuristic, indicating a large number of outbound links, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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=diana+build+guide+s9
    • http://files.brainreachnorth.ca/uploads/1/3/0/9/130969986/3641528.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8615/files/21775276030.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0899/files/38346978993.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/kagenu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9172/9309/files/brassica_oleracea_var._capitata_f._rubra.pdf
    • https://cdn.shopify.com/s/files/1/0432/6545/8336/files/functions_of_management_in_business.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/mosaxiropivixazovala.pdf
    • https://cdn.shopify.com/s/files/1/0440/6909/3541/files/talaforafeluziwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/wuxalejekokenofa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8886/files/99729102830.pdf
    • https://cdn.shopify.com/s/files/1/0438/2267/8173/files/jogomiwegojeve.pdf
    • https://cdn.shopify.com/s/files/1/0432/0106/9220/files/counseling_theories_and_techniques.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006444.bin
3acb151497926920d448a318fa8ca0dd680fcf51706a5a0bf1e61d67e992ee10
pdf-font-stream PDF embedded font (sfnt) at offset 0x6444 5192 bytes
font_01_sfnt_off000075f0.bin
0beec0c108301753d3708b542023662427de134bfe44914d6d410ba03f73048f
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F0 15048 bytes
font_02_sfnt_off0000a48a.bin
9f858655571ea719834e7f05387c4c83781056d704dc0a8044185ef8d130ca3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA48A 16104 bytes