Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aef50ab915de65d…

MALICIOUS

PDF

40.6 KB Created: 2020-08-07 04:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 505d1f230662bb6e09f15c2d0c2e7152 SHA-1: f48efd8532ad19bb9b3fd2109967bac520408ce7 SHA-256: 0aef50ab915de65dd826badbbd0ad66b1c656ba29dfc575fd79758f06de1ff0e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure, disguised with keywords related to Medicare benefits. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to lead the user to external, potentially harmful, content. No scripts were extracted, but the PDF structure itself is used to host and present these links.

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/wb?keyword=medicare%20benefits%20schedule%202019%20pdf
    • http://files.raynecreative.org/uploads/1/3/1/4/131408432/jopivuzujilob.pdf
    • http://files.sharpsindianstore.com/uploads/1/3/0/9/130969131/d2ce74.pdf
    • http://files.legendsmeltingrecycling.com/uploads/1/3/2/7/132711999/2f13fe5b51cf79e.pdf
    • http://files.divorceandfamilylawattorney.amoriandassociates.com/uploads/1/3/1/3/131398338/243ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/4457293311.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0434/0642/6275/files/xurimifomoputom.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7570/files/duke_s_anesthesia_secrets_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/49621519668.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/53313176224.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/literary_devices_worksheet_10th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/urc_8820_cisco.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/22242443956.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6325/files/rozalotesavivanapen.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3964/files/xeroreriwowujujipabitefon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76410179135.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9898/files/useful_unix_commands.pdf
    • https://cdn.shopify.com/s/files/1/0447/9628/0993/files/us_address_sample.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_off00005e62.bin
642afc748670e69b8784b3d3474e540c43755705bc9b3fbfb6578a7b1a2ab75d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E62 5872 bytes
font_01_sfnt_off0000725e.bin
abef572cdceddb84efa8e4c4168d546f1d3291f02caf5f11ce9c0ea90273c70a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725E 10208 bytes

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