Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c7d0a2da545731…

MALICIOUS

PDF

94.1 KB Created: 2020-07-09 12:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd4057e418a16860b6822a0918084c64 SHA-1: f341df4e0e83fddf6d4341ded2e8a0ab8aaf12fb SHA-256: 22c7d0a2da5457316b1d2873fa33f50f1c9a44a77b6a2914815f02ebbfe318a0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various PDF files, indicating a link farm designed for SEO manipulation or malicious redirection. One of the primary links directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'map of baguio city pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent of the embedded 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.ru/pify?keyword=map+of+baguio+city+pdf
    • http://files.addisongraphics.com/uploads/1/3/1/6/131606619/zixud.pdf
    • http://files.seedrinkeat.com/uploads/1/3/2/6/132681204/jalosozapatobe.pdf
    • http://files.zanyunoodles.com/uploads/1/3/0/7/130739381/sikete-wemotuta.pdf
    • http://files.yogashak.com/uploads/1/3/0/9/130969910/zevuru.pdf
    • http://files.artandroulla.com/uploads/1/3/1/3/131380773/6e51b943ebb202b.pdf
    • http://files.westernslopescale.com/uploads/1/3/1/8/131857690/5281098.pdf
    • http://files.finalfinishdetailing.com/uploads/1/3/2/7/132710655/levin_linebedanelu_vidaki_vukadidi.pdf
    • http://files.crescentmoondesignsjewelry.com/uploads/1/3/0/8/130873738/suwekitumipuwa_netowajilavo_vutok_givusa.pdf
    • https://gefubeg.files.wordpress.com/2020/06/lovalo.pdf
    • https://semezaxabe.files.wordpress.com/2020/06/mazitosinoxigowarasuz.pdf
    • https://jejedikelul.files.wordpress.com/2020/06/82226845550.pdf
    • https://tifavupil.files.wordpress.com/2020/06/dusijotemo.pdf
    • https://gosivev.files.wordpress.com/2020/06/kekutitarufogegeworuvosu.pdf
    • https://nuredetadu.files.wordpress.com/2020/06/33263281565.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78030006053.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mubexuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83390791822.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_off00012945.bin
dd37933710be0f7566aa17e4fa5a0df0a619ba05e81f2b1b9f3c015c386e803a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 4920 bytes
font_01_sfnt_off00013a18.bin
319d119398bae8a193ed16f2b7b200516a620ab46b99c92ac06f5c357220e3b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 15972 bytes

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