Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40a5e1c047cd9d1…

MALICIOUS

PDF

40.9 KB Created: 2020-09-04 15:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1134e1c532dc2205cf86f05042f0c49b SHA-1: 032f8dafc1874a35784555980a763d6f040f3bee SHA-256: b40a5e1c047cd9d19f36955e6a1980f3330fb81cdc82be92d3e85b45cc16f3ae
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, https://ttraff.cc/wix?keyword=android+room+kotlin, is identified as a known malicious redirector. The presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious content, likely for further exploitation or credential harvesting.

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.cc/wix?keyword=android+room+kotlin
    • https://static.usrfiles.com/ugd/b8c837_3e24c6fa2c754dc99b2900516f28e6c8.pdf
    • https://static.usrfiles.com/ugd/97368a_f798e7d3e71d4b598ffcb748bdd10348.pdf
    • https://static.usrfiles.com/ugd/7b00a0_9586f3f696534452afa8efceca6c1813.pdf
    • https://static.usrfiles.com/ugd/b8c837_b53e9525bd1749be8c2034ce0e38c3fb.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/59272132816.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/african_traditional_culture.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/multiplying_and_dividing_rational_numbers_worksheet_7th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/borewell_recharge.pdf
    • https://cdn.shopify.com/s/files/1/0431/1760/9122/files/94629601632.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/obstacle_avoiding_robot_using_ultrasonic_sensor_arduino.pdf
    • https://cdn.shopify.com/s/files/1/0435/3897/2831/files/leica_m_buying_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/naxedutaninudizagusud.pdf
    • https://static.usrfiles.com/ugd/952c2e_a3b89cb2491445f49d45a7c2357705f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_04a9ea6336e54b33a7498d49155cc6e9.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_off000059d5.bin
93d11c62db2081e523fe145e729134235b123d2e4d8f9f089c17a179d4287add
pdf-font-stream PDF embedded font (sfnt) at offset 0x59D5 4636 bytes
font_01_sfnt_off00006983.bin
2bf60b0452b88891131d38c0e373d098fed8c08a7c9db1652f86c74b911e2d36
pdf-font-stream PDF embedded font (sfnt) at offset 0x6983 14640 bytes