Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c626cb4525ee2fe…

MALICIOUS

PDF

49.4 KB Created: 2020-08-05 06:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c4b1006fc8d169ce84e561e6104a760 SHA-1: 9fa4fd032d2053e2c4ce3b1be5efd30eb8751e36 SHA-256: 5c626cb4525ee2fe45b921ac8201e2b086c98ecf4d6e01b302c7f070a98ca1dc
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one prominent link leading to a redirector associated with malicious activity. The document body, though heavily obfuscated, contains text related to 'mixed martial arts books pdf' and a URL that appears to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL suggests an attempt to lead the user to a harmful site, likely for further exploitation or phishing.

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=mixed%20martial%20arts%20books%20pdf
    • http://files.brinccborneo.org/uploads/1/3/0/8/130874148/wokibufos-bimuf-vosevogu-sitoforepa.pdf
    • http://files.junglingworks.com/uploads/1/3/0/7/130775561/190d62.pdf
    • http://files.dtbellevue.com/uploads/1/3/2/7/132712209/xasebavixib-poduseroniwe-mimigusivoboxe.pdf
    • http://files.indianaclassics.org/uploads/1/3/1/8/131871816/tidela.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/37348370125.pdf
    • https://cdn.shopify.com/s/files/1/0437/7280/5277/files/7177251774.pdf
    • https://cdn.shopify.com/s/files/1/0435/7128/2079/files/mizasabamutewexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/34181679696.pdf
    • https://cdn.shopify.com/s/files/1/0437/4613/2129/files/kitud.pdf
    • https://cdn.shopify.com/s/files/1/0432/2426/8968/files/robotic_arm_types.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwofejimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/8593566137.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/27708637111.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/dapiri.pdf
    • https://cdn.shopify.com/s/files/1/0440/9583/2216/files/gulowisafenusapitak.pdf
    • https://cdn.shopify.com/s/files/1/0437/1624/7703/files/zabujexozepevepudi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/37995375295.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000768c.bin
3952a2b0b9ef0c567ae304c17b3413bcac23d89aeeb20504415360e945b7c2b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768C 5148 bytes
font_01_sfnt_off0000880a.bin
49b31cc3d8593a63f98fb9f86e98c5ce23b89ab2580ecd6ad785d23e396eda02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880A 10208 bytes
font_02_sfnt_off0000aaa3.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA3 4324 bytes

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