Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3a1431f004d802…

MALICIOUS

PDF

41.1 KB Created: 2020-09-18 12:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2dec878b2bef8ee8d817574e4464b1a SHA-1: 70d599b28a122b4f20c482e0dc99e696a90765c0 SHA-256: 3d3a1431f004d802c026fae340d8a7a28402ab35aee9a65f6f43b58ec0c11aa1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=google+country+codes+api'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=google+country+codes+api
    • http://gelor.holycrossparishet.org/uploads/1/3/0/7/130776349/f6bea5c48a729.pdf
    • http://jarurusu.eztattoosupplyco.com/uploads/1/3/0/8/130814340/8144759.pdf
    • http://files.elevateyc.org/uploads/1/3/1/0/131070309/7538866.pdf
    • http://files.susamachar.com/uploads/1/3/1/3/131383821/3717941.pdf
    • http://files.officevalue.net/uploads/1/3/2/8/132814930/nedes.pdf
    • https://499ff932-2131-4c63-abab-1b99d751efc7.filesusr.com/ugd/eda9ba_9fd354d359c144218cefde0ef67d3f99.pdf?index=true
    • https://456cbf1d-7d03-4a8b-a9ce-0b47a1419450.filesusr.com/ugd/2074c9_c38cb18959ef423dbd852e6c65add19b.pdf?index=true
    • https://6f82707e-d2df-4bc0-85b3-951d91e54f66.filesusr.com/ugd/6d59ab_81fb212cc7394622923ec9c6d8038279.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/the_habitable_planet_ecology_lab_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/nizidavew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/kusenid.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/lovubusiramuwizif.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3883/files/fifa_mobile_17_apk_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0429/4718/2759/files/goboka.pdf
    • https://cdn.shopify.com/s/files/1/0435/4942/5823/files/multivariate_gaussian_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/megitonagorukutumogikar.pdf
    • https://cdn.shopify.com/s/files/1/0435/5571/7271/files/trng_by_hay_chng_by.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_off00006266.bin
3e0440389a6fac153acbb115feaf1082c645363935dc365986fa7dbe43143882		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6266 5372 bytes
font_01_sfnt_off000074cb.bin
9d3565be1147a3cc2c51b5be83d64cb93f550da97b19297e365dc7decdf4c620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CB 10236 bytes

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