Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f873f46336fcb7…

MALICIOUS

PDF

38.4 KB Created: 2020-09-01 00:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30aed4c140478bba8266f67721447f5e SHA-1: 1cd384529430c543fedc1f83adf61cb622ea9e86 SHA-256: 78f873f46336fcb76883910fcd996fab63c93af9cad0335b7cd83a56042f8296
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic further suggests a large number of external links, many of which are likely part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to funnel victims to 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/wix?keyword=centifolia+roses+information
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b47706_adfa55382852422da07682664e084208.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cb7f8b2e54842298383683189af6eff.pdf
    • https://static.usrfiles.com/ugd/b4609a_b7866bb59af1469c9252854ace52734e.pdf
    • https://static.usrfiles.com/ugd/7198c1_288bc8364f694340bf9a3fc6ff5ad2a8.pdf
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/69585865221.pdf
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/malayala_manorama_news_paper_today_palakkad_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/2802/0373/files/2007_suzuki_forenza_repair_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/pump_performance_curve_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/garidutepinuberujumeporaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7384/files/28108403610.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/pibaliborufukagawen.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/compress_mp4_video.pdf
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/oracle_number_format_2_decimal_places.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/68798626213.pdf
    • https://cdn.shopify.com/s/files/1/0435/2176/9627/files/pulipakutavulafubuv.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005843.bin
82045d354a9f441db9385f41afc6ba48cb33b25638f1459021fbbef17ac289e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5843 4816 bytes
font_01_sfnt_off00006887.bin
6a6151a766dde180f46e7eecb5af0e37bf00140024b852789d6b78f063107574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6887 11064 bytes

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