Malicious PDF — malware analysis report

Static analysis result for SHA-256 72786b1ee1f0ff33…

MALICIOUS

PDF

30.0 KB Created: 2020-08-17 02:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05417bec7e6b856bfa8dac483c592e86 SHA-1: 0631d845ec56076f12fb8ba1e12e278eb74332e8 SHA-256: 72786b1ee1f0ff3395525d5628627233826479f445a35aec9d2e8c1603beddbc
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a reference to 'Galaxy store apkpure' and a URL that is part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the heuristics suggest a phishing or scam attempt.

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=galaxy+store+apkpure
    • http://files.barbariancrossfit.com/uploads/1/3/1/8/131857304/gekobuv_rebojivod_lotud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5633/9871/files/4534375854.pdf
    • https://cdn.shopify.com/s/files/1/0429/2316/3801/files/97779932557.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0438/5118/6336/files/35792590861.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/jajumivamam.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/letter_recognition_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0436/7102/7865/files/zilotagebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/monoprice_graphic_drawing_tablet.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_off00003b30.bin
4172cdfc70167a593c5a6a261f5503259ee6ef22abb2c65e534844a6c69eeb97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3B30 5080 bytes
font_01_sfnt_off00004ca1.bin
532e96e25b3c553af81ce838790555b08d3b777d05b8d5c133e356a48398f510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA1 9084 bytes

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