Malicious PDF — malware analysis report

Static analysis result for SHA-256 74800380cbd68879…

MALICIOUS

PDF

41.3 KB Created: 2020-07-21 02:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bbbcb8de102b5bdd2840ea699afbd1b SHA-1: ae92c8da4218379504ccdc33de35acfa4f99b8bf SHA-256: 74800380cbd6887987f43dcfd3e925e2680a59d379385741d3d17c99fded0fcd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to an "Ecg made easy john hampton pdf" document, suggesting a phishing or credential harvesting 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.ru/wb?keyword=ecg%20made%20easy%20john%20hampton%20pdf
    • http://files.sbt-oman.com/uploads/1/3/1/3/131379578/1e02ce3.pdf
    • http://files.wwssm.com/uploads/1/3/0/7/130776826/lesimezugojexif.pdf
    • http://files.dmcicondosales.com/uploads/1/3/0/8/130873781/jowanodikamewotal.pdf
    • http://files.appimn.org/uploads/1/3/2/7/132740552/kekebitisogi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5951/0424/files/tarajotufuxabuzezig.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/nanemowakurubawo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6343/files/nizewaxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/riduxajarutalev.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/29058592680.pdf
    • https://zamukesokumo.files.wordpress.com/2020/07/zivajo.pdf
    • https://tojojawexixu.files.wordpress.com/2020/06/3441424570.pdf
    • https://bujajuzene.files.wordpress.com/2020/07/gimusike.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/funoxob.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/xufividuwunufodi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5232/files/bufubogadajuwom.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/27497703153.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/3890398560.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/41109628525.pdf
    • https://cdn.shopify.com/s/files/1/0434/5239/9773/files/47886331247.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/wimitirujarewalufogaduz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/9369304698.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/18845749438.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_off00006496.bin
38d443c024ce8332a2154e94dfd5e154f607d5280bd6983dde534ee3434c24a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6496 5316 bytes
font_01_sfnt_off0000769b.bin
9c37f95ed073e0fb387d978e4a64f65acac2151ba9c611b2ee1765aae624d5e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769B 9660 bytes

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