Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d55d3995d328da…

MALICIOUS

PDF

86.0 KB Created: 2020-08-13 22:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9ffea23c598009b76aebfcc869a5dec SHA-1: 396f6c407d378fafdc74e99c179d84f6ae085857 SHA-256: 73d55d3995d328da3a0a897637abcb87235a2cbc2374331e154938029ccb1fac
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/pify?keyword=atrocity+act+pdf+in+gujarati. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect the user to potentially harmful content, likely part of an advance-fee scam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=atrocity+act+pdf+in+gujarati
    • http://files.heracleous.org/uploads/1/3/1/3/131398488/2812021.pdf
    • http://latut.rootedcapitalmanagementgroup.com/uploads/1/3/0/7/130740490/a36dbc1cceb68a0.pdf
    • http://jasoga.doneitnow.com/uploads/1/3/1/0/131071157/jimerona.pdf
    • http://files.stowefamilywellness.com/uploads/1/3/0/8/130814644/lakufeka_felagum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/7797/3654/files/surajesolejomaretu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavokalozetaxolemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/tomoxodaboseginunef.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/90421899562.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/dozadegolebekifomigojaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3465/6423/files/77125337241.pdf
    • https://cdn.shopify.com/s/files/1/0441/0913/6024/files/english_word_with_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0453/8499/0888/files/agronomy_of_field_crops_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/86368327279.pdf
    • https://cdn.shopify.com/s/files/1/0450/5042/9598/files/la_jolla_shores_weather.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102af.bin
b34c37488ab66e36f92629651be87ed28e161f4ce280099eb1b77f468c1ea059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 5044 bytes
font_01_sfnt_off000113ea.bin
769aca965e728dba4f10120c88b629fd17420793349b14eb8d23590528f1575b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 11996 bytes
font_02_sfnt_off00013cdb.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDB 4324 bytes

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