Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1e108e0280378f…

MALICIOUS

PDF

118.2 KB Created: 2020-07-09 21:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee02c4953fd01c192810b9ea4ce3d0c5 SHA-1: b7fb3e5cd071ab768deec60f161cc3c99dedb8c1 SHA-256: 4e1e108e0280378ff3fb6a3c17208a7b68748cf47867c30e0c3f7b4d99442d26
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/wb?keyword=descargar%20libro%20composicion%20social%20dominicana%20pdf%20gratis`. This URL is likely part of a phishing or scam campaign, aiming to trick users into downloading further malicious content. The presence of a large number of external PDF links, many pointing to similarly structured URLs, further supports this as a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=descargar%20libro%20composicion%20social%20dominicana%20pdf%20gratis
    • http://files.capitalplanning.org/uploads/1/3/0/9/130969690/demalexa.pdf
    • http://files.schoolpatio.com/uploads/1/3/2/7/132740415/6232202.pdf
    • http://files.williamsburgrec.com/uploads/1/3/2/6/132682745/tagogumolizim_fofuzipupi.pdf
    • http://files.kellgallaher.com/uploads/1/3/2/6/132682630/7732394.pdf
    • http://files.cccrw.org/uploads/1/3/2/3/132303138/8c089303b771141.pdf
    • http://files.islandbeautyportland.com/uploads/1/3/0/9/130969243/522dd448b29a.pdf
    • http://files.rabbitmountainlavender.com/uploads/1/3/0/7/130738625/futevukumuj_lulamatix_libujuferebetux.pdf
    • http://files.bbawakeblogs.com/uploads/1/3/1/4/131437268/66807.pdf
    • https://mewazaxudo.files.wordpress.com/2020/06/ritonixaxirilugari.pdf
    • https://fevagop.files.wordpress.com/2020/06/28961301739.pdf
    • https://wofopisuf.files.wordpress.com/2020/06/remekebogidasolevi.pdf
    • https://fasotulabalo.files.wordpress.com/2020/07/rumelatapofodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53446206952.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulexukiwogefera.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6317908028.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001942d.bin
8f2948a8d17dbbb250604a765c8b1969b54f4a3ffe77bf3e38e48c2e15a877cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1942D 5400 bytes
font_01_sfnt_off0001a661.bin
45754f49d7e97883db509cf5a26a25aff10fc3a7caa0af3e7d37c456f428bcc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A661 10680 bytes

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