Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d69531fdc7972c…

MALICIOUS

PDF

40.4 KB Created: 2020-08-25 16:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23b35d52b7ace2f03eda82120d46ee5f SHA-1: b731e81a7f380c528dbfc7b4bcb2d71160ae99fe SHA-256: 45d69531fdc7972cb5d339f34839cc0ae08e25843bb01627926b8ea0e07e657c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack pattern is a lure to a 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.com/pify?keyword=impulsive+force+model+worksheet+1+answers
    • http://pazesaz.lovingdaniel.org/uploads/1/3/2/3/132302870/kadileta.pdf
    • http://files.stebex.com/uploads/1/3/1/4/131452841/59760482bd4.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/miduboneroduzoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3614/files/butterfly_valve_operation.pdf
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/93213559832.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4006/files/15413965939.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/2858679259.pdf
    • https://cdn.shopify.com/s/files/1/0441/1470/6584/files/list_of_private_bams_colleges_in_maharashtra.pdf
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/incident_report_sample_letter_for_broken_item.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/25008339588.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/nuzise.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/51077913541.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/boite_mail_free_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3907/files/dibezozusumixinejamemenes.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1802/files/kanelovegaveki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051fc.bin
74850931a56ef41b84ad44b9f094b5c77eb228d1919ff2c610d644eccf9fb266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51FC 2888 bytes
font_01_sfnt_off00005df6.bin
5022f7f58bd3461121a3caef4cf18f33c2a5ba02458279533fbea0a5d9616056		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF6 5600 bytes
font_02_sfnt_off000070f5.bin
6e27ce0f603acfb95603fbb10bc7357bbd6b466ddbde4cfa2005762ac5a5a7e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F5 10256 bytes

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