Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe7556263758def…

MALICIOUS

PDF

43.3 KB Created: 2020-07-10 02:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd0ef09b91c5c5e8f40a88d5ff351d92 SHA-1: 7de580afa1fd09912176331b5501285bfa31018f SHA-256: 8fe7556263758defe7e86a4e27c43b03f11ff61afc34a2e38afab9bcac1ac699
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/wb?keyword=fiscal%20policy%20economics%20pdf. The document body, though heavily obfuscated, also contains many of these URLs. This suggests the primary purpose is to redirect 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.com/wb?keyword=fiscal%20policy%20economics%20pdf
    • http://files.markmoran.com/uploads/1/3/0/7/130776100/88c05f34a6b6.pdf
    • http://files.counterearthgrid.com/uploads/1/3/0/7/130739817/fidokexaze.pdf
    • http://files.kaijumama.com/uploads/1/3/1/4/131407439/noxujuzexapo.pdf
    • http://files.mattandmaries.com/uploads/1/3/1/3/131398234/234a9c98d9b78.pdf
    • http://files.powerlux.com/uploads/1/3/2/6/132681690/b3fd917855a.pdf
    • http://files.lindachapmandesign.com/uploads/1/3/2/6/132683069/redizabokexelimib.pdf
    • http://files.kocanada-usa.com/uploads/1/3/1/4/131437538/zorodoke.pdf
    • http://files.ottringhamchangingseasons.com/uploads/1/3/2/7/132712505/vemaxo-wopofatijikerus-vapirowe.pdf
    • http://files.clearwaterridingschool.co.nz/uploads/1/3/2/7/132712034/8311069.pdf
    • http://files.outsideoff.com/uploads/1/3/1/3/131384660/wosobisarenenex-sipize.pdf
    • https://sajajijipob.files.wordpress.com/2020/06/gexejexenakomasik.pdf
    • https://ninisofaji.files.wordpress.com/2020/07/3580238793.pdf
    • https://zunibadavinu.files.wordpress.com/2020/06/87969762503.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dosadibevejigavo.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_off00006cfb.bin
9aaf448be20dd9b63ad110c2023fa97dcae579435a5f44b8e2df60e4086a7800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 4972 bytes
font_01_sfnt_off00007dc8.bin
6d17695abbeba60bd034e5ad388890acaf5524f61dda3627cd36fcca76749c77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC8 10076 bytes

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