Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15acf57ee1c61c6…

MALICIOUS

PDF

45.6 KB Created: 2020-08-03 18:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dc3e38ecff4bd7e1c92846c71e08090 SHA-1: ca441f8bf721c8e89a9aef8a3b66d2f5b8908364 SHA-256: a15acf57ee1c61c616e4f60ce31acffa125408f4d601726b48abe6906ff4425d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to ttraff.ru, indicating a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=acido+glutamico+neurotransmisor+pdf, which is likely the primary lure.

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/pify?keyword=acido+glutamico+neurotransmisor+pdf
    • http://files.insurancex.net/uploads/1/3/1/4/131437216/19cfa7fe37a.pdf
    • http://files.annahorsnell.ca/uploads/1/3/1/3/131380482/jabotafudisoziwugeg.pdf
    • http://files.recycledmindsimprov.com/uploads/1/3/1/1/131163507/rimip-ridol.pdf
    • http://files.stjohnsnorthversailles.com/uploads/1/3/1/4/131437680/sefuxosa-rejajej-wuzezerus-rulutulot.pdf
    • http://files.wicksitslit.com/uploads/1/3/0/7/130739802/3635628.pdf
    • https://cdn.shopify.com/s/files/1/0439/1924/5467/files/26068613164.pdf
    • https://cdn.shopify.com/s/files/1/0432/1941/9291/files/94300834979.pdf
    • https://cdn.shopify.com/s/files/1/0438/2402/1664/files/52032922993.pdf
    • https://cdn.shopify.com/s/files/1/0435/4670/6088/files/63234080178.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/18064116683.pdf
    • https://cdn.shopify.com/s/files/1/0440/6935/5670/files/tiwedivelekamonuxebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3090/files/21715761707.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/rezuvezogokovesekavarekow.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0605/files/rowobok.pdf
    • https://cdn.shopify.com/s/files/1/0435/0446/8134/files/relex.pdf
    • https://cdn.shopify.com/s/files/1/0430/9221/3911/files/84278626909.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/mizudikesilesuxedap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663b.bin
74e9a970431442eadc2477dc00dc5fb972fda5008dd6913d87e07ba2e998360e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663B 5344 bytes
font_01_sfnt_off00007846.bin
59ba29f9e2da417b084d5b76d7bd5fe8a2cd0a4594bd1369b0da973fcfb6aaa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7846 10188 bytes
font_02_sfnt_off00009b04.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B04 4324 bytes

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