Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b84b9cea228197c…

MALICIOUS

PDF

42.3 KB Created: 2020-08-08 20:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cee4a413d2662313d21f4219c011f4f SHA-1: 4cfad12d1cdebfbe9b309a9ce1fc78c4e0ac361a SHA-256: 5b84b9cea228197cdf2f42742c91a013373db191c4a04e25375d3937f069dd93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm designed to obscure malicious redirectors. The primary redirector URL, ttraff.com, is known for malicious activity. The document body, while containing a plausible lure, is heavily obfuscated and contains the malicious URLs, indicating an attempt to drive traffic to potentially harmful sites.

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=sample+letter+of+intent+for+graduate+school+pdf
    • http://files.abctsgmsig.com/uploads/1/3/0/8/130874396/fatetu-ruvawipa-wilukabalufur.pdf
    • http://jejit.canadian-apitherapy-association.org/uploads/1/3/0/8/130814423/julutufiti-nivetolutapoga-sefusokava.pdf
    • http://files.marleysinternational.com/uploads/1/3/1/3/131378999/e44bfd164eea3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6871/1321/files/meek_mill_mp3_download_skull.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/suzejodore.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/dufabekisakunegegobob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6430/3522/files/laligirumixaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/36280292215.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/annexure_e1_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/public_static_boolean.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5219/files/zofanokavuzepitovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/gozigumilokaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1162/files/54028991169.pdf
    • https://cdn.shopify.com/s/files/1/0432/4763/2548/files/relative_dating_in_archaeology.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3791/files/69917519316.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_off00006634.bin
efabd582207af2ddc63e1f39441a729fc124b167fb455cd3eed9c637f968b765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6634 5672 bytes
font_01_sfnt_off00007950.bin
64218f495f7b8b07b9c331c69b8107a1b1718f1b4f53de24575c2ad88614e06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7950 10144 bytes

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