Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb66a8cd2e98aa4…

MALICIOUS

PDF

40.2 KB Created: 2020-08-31 11:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 375d44dc80de96f05e68eeedca0a3812 SHA-1: ec8ba339e28991785bf16d9db78ae89313d5c85e SHA-256: ddb66a8cd2e98aa4dd7cdf1417d46670d994e2e477400c5e5d115f66039c968e
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, a technique often used to create link farms for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=buffalo+wild+wings+swot+analysis'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting it is the primary 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/wix?keyword=buffalo+wild+wings+swot+analysis
    • https://static.usrfiles.com/ugd/b8c837_7167622828f74a75b01f80f02a8e7c95.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_311d665a4cec428cb88ca415b7f4dc25.pdf
    • https://static.usrfiles.com/ugd/b8c837_48e0740b91574e8087fc1d573c0f6999.pdf
    • https://static.usrfiles.com/ugd/6290de_9c684a554e6743f7931ac70a61e204e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f17c6554e1ce4a27b2ea7a8688aa29ca.pdf
    • https://static.usrfiles.com/ugd/b91566_acc8f197a0cd41cd9a40e2ab3064301d.pdf
    • https://static.usrfiles.com/ugd/469aea_b2349b8e620e490fb63abce4752fc57e.pdf
    • https://static.usrfiles.com/ugd/b91566_a4f44fbd2c934d97b11de4134e56c327.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/72518585851.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/wuligazogozigi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/que_es_el_agar_en_microbiologia.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/66041627676.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_off00005fcd.bin
14cab34ee6311f213370582c4a2f527878ab5d387921205949690c71d988670c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCD 5224 bytes
font_01_sfnt_off000071c4.bin
6595f82c2adceda8cf73fa6406c99574c14723bee2078dd4cc1788f2aeff8aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C4 10092 bytes