Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f0c5332b9cf2d9…

MALICIOUS

PDF

48.3 KB Created: 2020-07-10 06:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d240495ba44c89804f57b2164e2cc09 SHA-1: 8055afe6e8dad012ff21d4b9e48f3b2883ba56b5 SHA-256: b3f0c5332b9cf2d9e48a461c9e434bc4dcdbff2148b79dfe9f2ce54d6a5d3f00
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body also contains numerous links to external PDF files, many of which appear to be generated for SEO purposes. This suggests the primary goal is to redirect users to potentially malicious content through a link farm. No scripts were extracted from this sample.

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=spaces%20of%20hand%20pdf
    • http://files.roseofhopefoundation.org/uploads/1/3/1/4/131438835/wosifefibozazanalaj.pdf
    • http://files.rebeccafreesemd.com/uploads/1/3/1/3/131380251/3451215.pdf
    • http://files.modga.net/uploads/1/3/2/6/132695361/dexemorogamebuw.pdf
    • http://files.mysoutherne.com/uploads/1/3/1/6/131606864/9138965.pdf
    • http://files.charity4shelter.org/uploads/1/3/1/3/131383247/6465191.pdf
    • http://files.flatspokecycles.com/uploads/1/3/1/4/131408529/6549756.pdf
    • http://files.devonvintagecarclub.com/uploads/1/3/0/8/130814652/mosew_wemifidopar_jitat_gadazoruxa.pdf
    • http://files.colorandlightpaintingworkshop.com/uploads/1/3/1/4/131437107/kutar.pdf
    • http://files.neaworks.com/uploads/1/3/0/9/130969637/tagemufi-nomaf.pdf
    • http://files.gilliantorckler.com/uploads/1/3/0/8/130874629/gomenevidi-kinepowa-xasokipa-xupuzateseroji.pdf
    • https://tatokarisifo.files.wordpress.com/2020/06/luwimasejebigimuguxosa.pdf
    • https://vabiliv.files.wordpress.com/2020/06/betupijok.pdf
    • https://bikubunuto.files.wordpress.com/2020/06/dufisenogefipubidutiziwa.pdf
    • https://pijuwipilo.files.wordpress.com/2020/07/45759837062.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41758367329.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28068876324.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34597476450.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24810932871.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89709194360.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_off00007628.bin
4b3b0dc1c1b6750497afb0dd1b221ce814d8c19f3c8d9ca52bcc8e9dd3c4766b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7628 4876 bytes
font_01_sfnt_off0000869a.bin
6de80cf78182dccefebb4795941434b59414e00df2064e3db11ea63330c3b50b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x869A 15036 bytes

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