Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fb5bee35323fa7…

MALICIOUS

PDF

44.9 KB Created: 2020-08-13 05:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 928e94a4e55b6c357e3580164287ff2e SHA-1: ffb0bccd82f4151696e31bb8cd9deb0bacf46d9f SHA-256: 16fb5bee35323fa758dae358f6aadb91668a7fffe67b2e850ef9ac744188d0fe
194 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=riesgo+operativo+y+financiero+pdf, which likely serves as a gateway to further malicious content or phishing pages. The document body itself is heavily obfuscated but contains references to URLs, suggesting an attempt to direct users to external resources.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=riesgo+operativo+y+financiero+pdf
    • http://files.dianakurin.com/uploads/1/3/1/4/131437064/4201348.pdf
    • http://files.dalyspenshop.com/uploads/1/3/0/7/130776483/zipufal.pdf
    • http://jimukul.3islandsdesigns.com/uploads/1/3/2/7/132740978/kisof.pdf
    • http://kazoko.sitebuilder.middletennesseeflyfishing.com/uploads/1/3/0/9/130969972/zuzunaxepitubi.pdf
    • http://xazevi.premierbeachpropertymanagement.com/uploads/1/3/0/7/130738638/jetonutirakiwuzatos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/tipos_de_carcinogenos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8262/files/tomezudulunuwojasapef.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/el_aprendiz_de_brujo_1_y_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/0703/9897/files/11275962576.pdf
    • https://cdn.shopify.com/s/files/1/0436/8531/4715/files/storm_in_a_teacup_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/fobevifagopema.pdf
    • https://cdn.shopify.com/s/files/1/0434/0649/1797/files/foxusevewe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8730/5629/files/kazunuzexijotarev.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/brainspace_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0431/1823/1709/files/95529831005.pdf
    • https://cdn.shopify.com/s/files/1/0430/7478/1338/files/muvabaluronej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6819160869.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_off00006219.bin
13dca164c5e44819f7637caedbfb5d8d734dfd6d86559988470af2727537409b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6219 5248 bytes
font_01_sfnt_off00007413.bin
0816d92376a657be8e4e160b876a4b8e1ed73ef5bc72e2f1802620d4559fdb91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7413 10720 bytes
font_02_sfnt_off000096a5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A5 4324 bytes

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