Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1580d4aeeec595b…

MALICIOUS

PDF

46.4 KB Created: 2020-07-09 11:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 367f1413a174cc6645dfae761b2c4bbe SHA-1: ef73748253f7d8de55e4ffcc41c49f9e88fb1245 SHA-256: a1580d4aeeec595be234e8d453bfdf355a05132965e4149b5e648eb21f6de94f
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to numeric-slugged PDF files hosted on various domains. One of the primary links, 'https://ttraff.cc/pify?keyword=nalukettu+house+plan+pdf', redirects to malicious infrastructure, indicating a phishing or malware distribution attempt. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=nalukettu+house+plan+pdf
    • http://files.techniquejobs.com/uploads/1/3/1/3/131398540/gavov.pdf
    • http://files.fmquiltbarntrail.com/uploads/1/3/2/7/132740549/49e3ee2.pdf
    • http://files.oldwakey.co.uk/uploads/1/3/1/3/131381352/472fc72fc075086.pdf
    • http://files.evansadopt.com/uploads/1/3/0/7/130738753/dirigefufusode.pdf
    • http://files.nickamatangelo.com/uploads/1/3/1/0/131070861/1e77b17a8.pdf
    • http://files.icgg16.com/uploads/1/3/1/4/131406785/xurabojimi.pdf
    • http://files.walterslawpc.com/uploads/1/3/1/6/131636746/fulexuzuko.pdf
    • http://files.gettingreadyfor100.com/uploads/1/3/0/7/130775856/9345326.pdf
    • http://files.americanacademicconnections.com/uploads/1/3/1/4/131409884/8646026.pdf
    • http://files.thestitchingplace.com/uploads/1/3/0/9/130969879/892e6ea3b5ddd.pdf
    • https://vesobijoz.files.wordpress.com/2020/07/kidunujumo.pdf
    • https://fazefamakof.files.wordpress.com/2020/06/60872295912.pdf
    • https://mitifej.files.wordpress.com/2020/07/futegaburoxepevi.pdf
    • https://taledenow.files.wordpress.com/2020/06/xojapogejajizawoxe.pdf
    • https://mazerero.files.wordpress.com/2020/07/29813766321.pdf
    • https://repawotevu.files.wordpress.com/2020/06/xosuvinurit.pdf
    • https://forivugovov.files.wordpress.com/2020/07/petawibezuwirofemawobes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20807514836.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.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_off00007952.bin
44c32941e61a728eb2507199f778bc2047b0677ff59a7bb56ae6cfc48767bb08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7952 4900 bytes
font_01_sfnt_off000089fa.bin
f59da0a1c088229bf7ae226f10a85abdd37bedfb71766be39114b68b26da5b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FA 10240 bytes

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