Malicious PDF — malware analysis report

Static analysis result for SHA-256 87abc50c218eb244…

MALICIOUS

PDF

47.2 KB Created: 2020-08-31 05:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a9bf1c5dff3ccfef4f900dad14958e3 SHA-1: 9f17f8fff99d4bee25382cfdb11acb5c18cee7c1 SHA-256: 87abc50c218eb244a00d1c360465ceeeb0d5bb86a5df8c889aced3b0da0ce1c2
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate document links, but one of the primary links redirects to a known malicious domain (ttraff.com). This suggests a social engineering tactic to lure users to malicious infrastructure. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of direct payload execution.

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/wix?keyword=server+hosted+desktop+virtualization
    • https://cdn.shopify.com/s/files/1/0429/5111/4908/files/corporate_finance_berk_demarzo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/84718304796.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/congratulations_letter_template_for_winner.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7364/files/52368210011.pdf
    • https://cdn.shopify.com/s/files/1/0461/9691/6374/files/jexod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0903/1840/files/38783308717.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/civ_vi_rise_and_fall_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/83927524402.pdf
    • https://cdn.shopify.com/s/files/1/0434/3404/9703/files/acronis_bootable_usb_format.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_off0000796d.bin
a752feb822f617782fdb4099fffd5f4c097f048fdbc667242f3d00fce48cceab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796D 5324 bytes
font_01_sfnt_off00008b88.bin
77b0801ae6301bf1590729607095f641aa52d4fcc9a326d8a515201ea92995f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B88 10660 bytes

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