Malicious PDF — malware analysis report

Static analysis result for SHA-256 038cd8f2de11efde…

MALICIOUS

PDF

55.9 KB Created: 2020-08-21 18:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6f2cc363ec0d4af88a77f25a4889e1d SHA-1: 3769735572b0ea2089b81d61fd45b11095d2e555 SHA-256: 038cd8f2de11efdeb8aed6aaabfaf5fc7eb41176f96e7dfc78ac52b606ade230
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to `ttraff.cc`. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a mass of external PDF links, many hosted on `cdn.shopify.com`. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector and a link farm suggests an attempt to drive traffic to malicious infrastructure.

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=conjugate+method+spreadsheet
    • http://files.viamux.com/uploads/1/3/1/4/131438423/fukezitegawajo.pdf
    • http://files.wiseowlwellnessaz.com/uploads/1/3/0/7/130775675/wisuvuvaruzo.pdf
    • http://tarotez.theharbordivide.com/uploads/1/3/1/6/131606523/memiwezemedoduzifuso.pdf
    • http://mamebi.rahamasha.net/uploads/1/3/0/7/130776499/9335505.pdf
    • http://files.stepintowomanhood.com/uploads/1/3/1/6/131637224/kenudekilegezi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/bioremediation_is_a_form_of_conservation_called.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/repidoviburex.pdf
    • https://cdn.shopify.com/s/files/1/0429/0543/6323/files/german_language_books_for_beginners_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/zizonasesuregopodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/96712506305.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/nifokijuzexebevexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/lotajubapiwovam.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9637/files/high_earners_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/befube.pdf
    • https://cdn.shopify.com/s/files/1/0435/4562/4744/files/german_learning_books_for_beginners.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_off00009c87.bin
9ea372cd7d51726e276b90a28ce76f1ef7ea54ae6970a478452bea8d10105f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C87 5324 bytes
font_01_sfnt_off0000ae7b.bin
d2204d2512895deddb21b51b94073b16360d61f6fb86c6408fb128d7b548558d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7B 10580 bytes

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