Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d425c7edff5563…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 11:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39f81363e42defaeaf6d8902befd916a SHA-1: 69e7a53896966cb3e6be5da9a231d0710303ebba SHA-256: 22d425c7edff55630e53126f2126b301b13e1cb345f64972adabbdc301033396
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to what appears to be a link farm hosted on Shopify. One of these links, https://ttraff.me/wix?keyword=anahtarlamal%25C4%25B1+g%25C3%25BC%25C3%25A7+kayna%25C4%259F%25C4%25B1, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this malicious URL, suggesting the document's primary purpose is to lure users into clicking it. The presence of numerous other PDF links further supports the link farm hypothesis.

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.me/wix?keyword=anahtarlamal%25C4%25B1+g%25C3%25BC%25C3%25A7+kayna%25C4%259F%25C4%25B1
    • https://cdn.shopify.com/s/files/1/0434/0944/0924/files/smelly_shoes_dryer_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/wunoxatataninipibusude.pdf
    • https://cdn.shopify.com/s/files/1/0434/0511/5544/files/nujumek.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/css_diner_answers.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3e1e33ee8e147dd8f8349ff164afa72.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/albert_camus_yabanc_yandex.pdf
    • https://cdn.shopify.com/s/files/1/0434/8503/6706/files/49303189862.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/disiwe.pdf
    • https://cdn.shopify.com/s/files/1/0450/3640/4900/files/zimsec_a_level_chemistry_notes.pdf
    • https://cdn.shopify.com/s/files/1/0460/1665/9623/files/auditor_general_of_ontario_report_2016.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/45283890018.pdf
    • https://cdn.shopify.com/s/files/1/0437/2620/9175/files/convert_ppk_to_pem.pdf
    • https://cdn.shopify.com/s/files/1/0437/5629/0206/files/chess_for_dummies_free_download.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_off00006689.bin
a536f8bc777c669a338e01789c8d4c896f81d0f1de7e64f8b3b2a7f10e577326
pdf-font-stream PDF embedded font (sfnt) at offset 0x6689 5640 bytes
font_01_sfnt_off000078e2.bin
c494ab59aa75059a0aa93b18a105a3915cbd1ac1ec21b6f4e4c5de7ebb0e12ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x78E2 11712 bytes