Malicious PDF — malware analysis report

Static analysis result for SHA-256 df87b7c7ac457593…

MALICIOUS

PDF

47.9 KB Created: 2020-08-29 19:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd01e854c9e02ca89966cd102c5bd0b SHA-1: a36e19a631d1e9bc7c9f0e87d411f415960f31a4 SHA-256: df87b7c7ac457593801bf311896b2565d24c53ffae29e990b06fae851eb7d0a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding a large number of external links, with the first identified link being to 'cdn.shopify.com'. The document body, though heavily obfuscated, contains the title 'Frases decepcionado da família' and the malicious URL, suggesting a social engineering lure. No scripts were extracted from this sample.

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/wix?keyword=frases+decepcionado+da+fam%25C3%25ADlia
    • https://cdn.shopify.com/s/files/1/0433/9836/5340/files/tagupelumofixofobunokituf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5993/files/fungal_pneumonia_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0449/8187/8942/files/vupuxilufebiwivu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4272/6310/files/background_remover_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9605/files/how_do_i_reset_a_github_repository.pdf
    • https://static.usrfiles.com/ugd/b8c837_0abb086997794cdb867f6fd60c66575f.pdf
    • https://static.usrfiles.com/ugd/b8c837_64ff54eb1c6c43e0a006ccc99c6f5e33.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fbb7c673101445893d7852fea85c092.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a30c15573c4d93b5b754f527edbcfe.pdf
    • https://static.usrfiles.com/ugd/b8c837_23e82f2fbb664178bcb84bfe74ac4eef.pdf
    • https://static.usrfiles.com/ugd/b8c837_235f415b5d794238838a0d95b049f254.pdf
    • https://static.usrfiles.com/ugd/b8c837_80390e738f7b4cc19f5fc7b7833ebd44.pdf
    • https://static.usrfiles.com/ugd/b8c837_10dc3f92d74e4203883738d3d2ffd212.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5c203be6fd04277a123e4f82d50e7ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_f814e15be08948cba6ef220efbb1addc.pdf
    • https://static.usrfiles.com/ugd/b8c837_8de2c3f5a3e14d688bca221f8f91ed6d.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_off00006d0a.bin
a2452e2eac69c399dc3663550b51aa4d73ab168e5d90463763be3c011ee9386f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0A 5016 bytes
font_01_sfnt_off00007df2.bin
885f1b3e3197d133cb4a58f1b2482291448b1956e9e8f59eeed846d2c8f09bb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF2 11972 bytes
font_02_sfnt_off0000a298.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA298 4324 bytes

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