Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2357f758fda249…

MALICIOUS

PDF

75.0 KB Created: 2020-09-01 00:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce6296412ca26793928081d522dce1a2 SHA-1: bce88516bf6b0747ae9bd0192825c7422cabe1c1 SHA-256: 4a2357f758fda249e3d858f2b2496805d132282bf8d77e9ff328bc6cb0a78a37
152 Risk Score

Malware Insights

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

The PDF contains a direct link to a malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and keywords related to 'iritis treatment guidelines', suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to benign Shopify URLs, likely to mask the malicious redirector.

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=iritis+treatment+guidelines
    • https://cdn.shopify.com/s/files/1/0431/6528/6564/files/biochemical_test_for_fungi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0069/8792/files/android_tv_raspberry_pi_3_sideload_apps.pdf
    • https://cdn.shopify.com/s/files/1/0432/3767/1080/files/24235297704.pdf
    • https://cdn.shopify.com/s/files/1/0460/0404/3935/files/everfi_stem_career_exploration_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/7228/9942/files/bawafovuxoraligegewazusu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/tazemewusirowujutimu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2001/0140/files/well_stardew_valley.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/tatemurisan.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/87496096307.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/malerofefamizekigo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavatorumagenikezelun.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/xomumab.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/98967443245.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/3758695860.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_off0000eab2.bin
e605d597995a3accf04c9cc58c71be8df5fd48048753cb28cd8fd4b72f058d0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 5080 bytes
font_01_sfnt_off0000fbdc.bin
3f07169923e6dda8a494ab9bbeb6af9bf3f6bfc51e96f92c84a44c349395bd4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 10292 bytes