Malicious PDF — malware analysis report

Static analysis result for SHA-256 76877f849ab57fdb…

MALICIOUS

PDF

47.6 KB Created: 2020-08-30 23:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef94d06a29b14a8083b9a925d541b376 SHA-1: edf4a87b45248df870006d4482a82cdbc1f53df4 SHA-256: 76877f849ab57fdb500e2a168044fe502aa708bcde5e2ac390c872bedb788047
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=ngu+idle+exp+guide', suggesting a lure to a malicious site. The presence of many external PDF links indicates a link farm, often used for SEO poisoning or to distribute further malicious 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=ngu+idle+exp+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b98abb_a2ef8022d33b40be93b16adbdd2659ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd6c8e0a3cb7448b9d2ccae6fdfe30c9.pdf
    • https://static.usrfiles.com/ugd/696117_61313093ec8540958e9c57950fed3c38.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_2f08b901da99463ab4d2f1ad0739e909.pdf
    • https://static.usrfiles.com/ugd/1f2646_be6e7adbf9714b2aadfd180ef6d35b22.pdf
    • https://static.usrfiles.com/ugd/b8c837_66906439af90418b9afd88414fe53845.pdf
    • https://static.usrfiles.com/ugd/3e9e83_60dcfe4a40b0407589f3e0589f34778f.pdf
    • https://static.usrfiles.com/ugd/1be480_826150365e544a8c9206c91196aaf007.pdf
    • https://static.usrfiles.com/ugd/9ea91e_7cd87e2c78704b829e474ba3f4f85111.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d8a2d61ca7443adb6fc1a05c5d2f4b2.pdf
    • https://static.usrfiles.com/ugd/599f1c_f73f533d7f63462589779c69dab83d75.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c308b80a8334f6cbbac0840859dd934.pdf
    • https://cdn.shopify.com/s/files/1/0437/7424/7069/files/pukuribusejuxose.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/rimenamerozudufetizawil.pdf
    • https://cdn.shopify.com/s/files/1/0447/6128/4757/files/c_condition_variable.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/phg_komtel_login.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_off00007349.bin
a4a391367066c7ac6233b7693448f493fb7e29c12a8e620b0a641f872d2c29be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7349 4680 bytes
font_01_sfnt_off0000834f.bin
87ec495556849eb98e4bfc1644f0497de156b1df9b8c6818e4322be3e62ff88b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834F 14844 bytes

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