Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc7dd0d828a6cb4…

MALICIOUS

PDF

50.3 KB Created: 2020-09-16 19:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed707d5e9eeb2be4880a6ac61a1a256a SHA-1: b1c306b5338f930e10da9d7301c0ba73cf43903d SHA-256: 9bc7dd0d828a6cb47326e2d4fecc164f075c8f686ec65763f196b74ca33748be
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it contains a link farm with a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/wix?keyword=citizen+participation+pdf', which is also listed as a malicious redirector. This suggests the PDF's primary purpose is to lure users to malicious sites.

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.link/wix?keyword=citizen+participation+pdf
    • http://files.susanaamaral.com/uploads/1/3/1/4/131453645/9ade071.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/32216621850.pdf
    • https://cdn.shopify.com/s/files/1/0457/0120/2076/files/nitekobid.pdf
    • https://cdn.shopify.com/s/files/1/0433/5153/9861/files/council_tax_support_claim_form_bromley.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/1753754656.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1555/files/cyberflix_apk_install.pdf
    • https://cdn.shopify.com/s/files/1/0431/3913/7702/files/49286288186.pdf
    • https://cdn.shopify.com/s/files/1/0464/5152/3752/files/17551946765.pdf
    • https://cdn.shopify.com/s/files/1/0432/5185/9611/files/bulletin_de_salaire.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/pigijipuxexu.pdf
    • https://1de5f78d-fb8d-4477-9ff2-59abc8e372b1.filesusr.com/ugd/43d598_843839ed58ea431b85af770ead668548.pdf?index=true
    • https://549013cf-aa52-4539-a2d8-f93a8c309b4f.filesusr.com/ugd/77941b_ffc9d46dbd5e48d88b44e7fe3db5c8ad.pdf?index=true
    • 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_off000088b6.bin
d50802755711538c5d072043bdc796fd268223e54fd19570dc0a637e7028f499
pdf-font-stream PDF embedded font (sfnt) at offset 0x88B6 4896 bytes
font_01_sfnt_off0000996f.bin
613dc80ab6a42a77c1fbbba63a45abe2df42a6a103b9455edf5372f8a47fe434
pdf-font-stream PDF embedded font (sfnt) at offset 0x996F 10272 bytes