Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ad3ebe1b505a21…

MALICIOUS

PDF

44.2 KB Created: 2020-08-30 07:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d416724cfdb261f4571dd257f7339c16 SHA-1: 65051cd619ba8e319f125a1935e0a2fda903d8ac SHA-256: 70ad3ebe1b505a21c9b7dd71133e2424ae6b36283198c1552302e3e29b3a3d39
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, with a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the embedded links. This suggests the primary purpose is to direct users to potentially harmful external content.

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=a+guide+to+modern+econometrics+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ee4a13_6b5590eebfa44ce69f10c8dbb32b1d2a.pdf
    • https://static.usrfiles.com/ugd/c836c3_75f92ddf97f8425589d0cbb0fa041a90.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c74718e4fbe434ea351fb67400623f9.pdf
    • https://static.usrfiles.com/ugd/ade4e6_10edb24d073d4cd8abccbb744bf67d0c.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_f546372de8ce4d70992c6960e5e1e91e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b72b27a34f524b0f8a4beff5cfb824de.pdf
    • https://static.usrfiles.com/ugd/b8c837_16d77500cd1d46fa8b209575995d7c32.pdf
    • https://static.usrfiles.com/ugd/7f16bd_cf945da11dd44af596eab1e3d8e7c4a1.pdf
    • https://static.usrfiles.com/ugd/ddb60a_964c923a1aa045fba2c5c1b580dbaac2.pdf
    • https://static.usrfiles.com/ugd/ae059d_c2caa16af9d94104b079a19916abeabc.pdf
    • https://static.usrfiles.com/ugd/dc98cc_69d5f5d6d5c041f0a941349af556ebd1.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_7d21a08354b046c496af4e462ed56c8b.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/tajazipusa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2060/5848/files/10523822145.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/wawowevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2139/4343/files/sql_server_interview_questions_and_answers_for_experienced.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f55.bin
2f5fcc37ebe2a7850140699d5b1d515e6dcac146999f89f4cb3403b010b1851b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F55 5224 bytes
font_01_sfnt_off00008105.bin
242e09b6324317ebc21c3d4d040ee182bdf164f1ce5ae42ea8709db21aca67ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x8105 10288 bytes