Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5a0b1c4dc001d9…

MALICIOUS

PDF

39.1 KB Created: 2020-08-23 21:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fb5d750371be38669dfba308cfaf5e4 SHA-1: 0dd83c72549049a28cb6ffa79e6281e6db903281 SHA-256: da5a0b1c4dc001d966d703b7e759596e8479729a5248637425f18ddbe7774643
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free printable Christmas banner template. The ML classifier strongly indicated maliciousness, and the PDF was found to link to a large number of external PDFs, likely for SEO manipulation to improve search engine ranking. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=free+printable+christmas+banner+template
    • http://files.bishopsstortfordjudo.com/uploads/1/3/1/1/131164424/zasawijup-piruroxi-zakotopa.pdf
    • http://xibonefij.q-avery.com/uploads/1/3/0/7/130775169/fde6b66f3.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/jinisavifuvakuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xeniwepisovera.pdf
    • https://cdn.shopify.com/s/files/1/0438/3870/1728/files/weather_report_online_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/3495/8229/files/old_c._g_song_dj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5543/9263/files/83865352998.pdf
    • https://cdn.shopify.com/s/files/1/0434/4781/2248/files/67402924184.pdf
    • https://cdn.shopify.com/s/files/1/0434/9925/8022/files/53564370326.pdf
    • https://cdn.shopify.com/s/files/1/0437/3040/3477/files/seasons_and_ecliptic_simulator_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6064/files/tijogudajut.pdf
    • https://cdn.shopify.com/s/files/1/0445/5759/8884/files/sumot.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_off00005aa9.bin
d65e5d96436aee902f7619f526a30f9b5fbfa124e912900851834d71cadaf195
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA9 5268 bytes
font_01_sfnt_off00006c56.bin
b998ef2f0eb09464b22360b38571fcd170cbb46b663a068cf0d2f3e3b96357e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C56 10336 bytes