Malicious PDF — malware analysis report

Static analysis result for SHA-256 432e0c13e3faa622…

MALICIOUS

PDF

34.4 KB Created: 2020-09-01 07:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef4b07bfca3574fb72139953d561d844 SHA-1: 9624d2be7f069dfd82e9de7ec3b442ace18f7250 SHA-256: 432e0c13e3faa622ff8a71ebdbfcc91016826da572e209ff4204cd29144ef71f
152 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which, https://ttraff.cc/wix?keyword=bms+performance+sales+engineer, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to "Bms performance sales engineer" and the malicious URL, suggesting a lure for job seekers. The ML classifier also strongly indicated maliciousness.

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=bms+performance+sales+engineer
    • https://static.usrfiles.com/ugd/c068f8_4f3347deb50f493fbdc3b428fc8e31b8.pdf
    • https://static.usrfiles.com/ugd/e2c250_1ce695a768a34b1db87b36ca1b196ec7.pdf
    • https://static.usrfiles.com/ugd/db93e9_d703e1682f0749df8024f172e57c0b2b.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/java_programming_language_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1417/files/27299167740.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/80666083405.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/zerarub.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/pelopesuxojuvulubolutute.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/40363491274.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/61398908067.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_off000048fd.bin
ce59191c9349a231d88be0d306263eba32fe216f9b292589948b97988d66ea74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48FD 5384 bytes
font_01_sfnt_off00005b39.bin
ecc5a19a2328ca51786aa67ae4b4f3f63c73c65db5512ee837235cefaa031334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B39 10000 bytes

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