Malicious PDF — malware analysis report

Static analysis result for SHA-256 156b27632002ba26…

MALICIOUS

PDF

36.0 KB Created: 2020-07-26 07:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 858b72fe9539f69df8d38cad98287cd6 SHA-1: 984488672c09d61a5fe6e0e74522de48ba0ef383 SHA-256: 156b27632002ba26e0a539679cc7e7ca2734f87ffae599a4084ff7c6431f95f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to '4pics1word daily puzzle answers', suggesting a lure to a game-related website which is then redirected 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.com/pify?keyword=4pics1word+daily+puzzle+answers
    • http://files.elermorevaleshoppingcentre.com.au/uploads/1/3/0/7/130775245/narodenina.pdf
    • http://files.flashforge.com.hk/uploads/1/3/1/8/131871864/4563938.pdf
    • http://files.zumbawithmelody.com/uploads/1/3/1/6/131606546/6701429.pdf
    • http://files.2crossstreet.com/uploads/1/3/1/4/131413718/71aa374e56.pdf
    • http://files.artomel.com/uploads/1/3/1/3/131380299/1186995.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1063/7475/files/buxubesoromaditoxawirige.pdf
    • https://cdn.shopify.com/s/files/1/0433/0304/3230/files/95243919349.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1827/files/66239852948.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/jalifajuwerigonik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5084/files/64460292507.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4385/files/magupufunesafa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/mevefariwusixofeparuki.pdf
    • https://cdn.shopify.com/s/files/1/0433/6123/9192/files/nusoxilapixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7074/files/50148469679.pdf
    • https://cdn.shopify.com/s/files/1/0428/3177/3852/files/bolet.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_off00005226.bin
06b63d205b05756558883d05efe001a68cf347e19349d7e267670327a383c932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5226 5156 bytes
font_01_sfnt_off000063d2.bin
70226a00637e2d5ba5c1df59bef964df0c7925636e93fc848d072c8ee0368eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D2 9040 bytes

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