Malicious PDF — malware analysis report

Static analysis result for SHA-256 902bc4c2f310d303…

MALICIOUS

PDF

42.8 KB Created: 2020-08-06 16:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c71a505f4d8082fb710fa8e2e2a4c7a SHA-1: 45ca132ee4abcb9eef0c87fe93b9ce3d8c172b4e SHA-256: 902bc4c2f310d303573dc8feca499b45a3eeac586bce9c7cc20519ef16aa2fd4
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.com/pify?keyword=biomagnetic+pair+therapy+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site.

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.com/pify?keyword=biomagnetic+pair+therapy+pdf
    • http://files.farnhamfringefestival.org/uploads/1/3/1/8/131871992/fawaluj.pdf
    • http://files.drsamanthonyskin.com/uploads/1/3/0/7/130775435/zufutijazijemuxiv.pdf
    • http://files.marshallmcmahen.com/uploads/1/3/2/7/132710638/bidunisuzizufo_fupunebib_lezivudu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2381/0203/files/11293957281.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/54695745818.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/cerita_pendek_anak.pdf
    • https://cdn.shopify.com/s/files/1/0430/7333/9559/files/41733008682.pdf
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/fuxoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/how_to_direct_connect_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/74401145152.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/tesirej.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/gajuladoxaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0451/1626/0517/files/intro_to_theory_of_computation.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_off0000698b.bin
b27d7065271d34c59e89132c14c5e63ce4a132620740eb9259fa661fbac7b931
pdf-font-stream PDF embedded font (sfnt) at offset 0x698B 5512 bytes
font_01_sfnt_off00007c2e.bin
1157b9713a16d350773e1a20b964d5ce298778a745207319cfed9a30e4a2f57a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2E 10096 bytes