Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4b22dabdce5bde…

MALICIOUS

PDF

84.8 KB Created: 2020-08-07 15:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c655714d4758254de4f43d80da4e6f3 SHA-1: e48e7410d3d1306bd561be57014e729674a1f4f6 SHA-256: 8b4b22dabdce5bde4a659d8807f6cfa66444437316b88f9d15c0b90c615a3be3
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.cc/pify?keyword=the+aeneid+in+latin+pdf', is the primary indicator of malicious intent, likely serving as a lure for further malicious activity.

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=the+aeneid+in+latin+pdf
    • http://files.lakevilleroboticsmn.com/uploads/1/3/0/7/130775645/zerutumo_zapulesuriro_relal_vevunoruruk.pdf
    • http://files.hopeofglorychristinmebriankinnett.com/uploads/1/3/1/3/131383657/rubawetanen.pdf
    • http://ruxutedid.rivermontfarm.com/uploads/1/3/0/7/130775997/a6bd8dbb.pdf
    • http://files.taiwanpianofestival.com/uploads/1/3/2/6/132681670/bifedopav.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/sufumedetatodub.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/komugaguwixuraz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4739/4199/files/how_to_unzip_gz_file_in_linux.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8080/files/84395891472.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2321/files/xezuzatiwiduvof.pdf
    • https://cdn.shopify.com/s/files/1/0432/1804/3040/files/rovalorikiwuwefikun.pdf
    • https://cdn.shopify.com/s/files/1/0434/2362/9477/files/wafom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/97396647053.pdf
    • https://cdn.shopify.com/s/files/1/0437/3757/9674/files/virtualbox_windows_xp_no_internet.pdf
    • https://cdn.shopify.com/s/files/1/0453/2440/2843/files/avadhanulu_and_kshirsagar_engineering_physics_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/kufexuraduwarupigujepil.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/94967718687.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7541/files/70138579438.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_off00011182.bin
ba73df633229eb502799258bc8a86f93f9f2953a41232ee522bcc1ae972b210f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 4804 bytes
font_01_sfnt_off000121dd.bin
37bc96dc9c871f0981bb7690f2987c756a90daa8e852f1bd2cf144640949a820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 10604 bytes

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